UnratedFix available
UBUNTU-CVE-2026-55953
The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected. An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All subsequent application traffic is readable and modifiable by the attacker. This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to ssl from 5.3.4 before 11.2.12.11, from 11.3 before 11.6.0.4, and from 11.7 before 11.7.4. Whether OTP before OTP 17.0, corresponding to ssl before 5.3.4, is affected is unknown.
Announced Group revision 1
Original source ↗UBUNTU-CVE-2026-55953
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:UBUNTU-CVE-2026-55953
erlang
Source reference: /affected/0/package/name
- Affected versions
- 1:16.b.1-dfsg-4ubuntu1
Source reference:
/affected/0/versions1:16.b.2-dfsg-1ubuntu1Source reference:
/affected/0/versions1:16.b.2-dfsg-2ubuntu1Source reference:
/affected/0/versions1:16.b.3-dfsg-1ubuntu1Source reference:
/affected/0/versions1:16.b.3-dfsg-1ubuntu2Source reference:
/affected/0/versions1:16.b.3-dfsg-1ubuntu2.1Source reference:
/affected/0/versions1:16.b.3-dfsg-1ubuntu2.2Source reference:
/affected/0/versions1:16.b.3-dfsg-1ubuntu2.2+esm1Source reference:
/affected/0/versions - Fixed versions
- 1:16.b.3-dfsg-1ubuntu2.2+esm2
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/1/package/name
- Affected versions
- 1:18.0-dfsg-1ubuntu1
Source reference:
/affected/1/versions1:18.0-dfsg-1ubuntu2Source reference:
/affected/1/versions1:18.2-dfsg-2ubuntu1Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu1Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu2Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu3Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu3.1Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu3.1+esm1Source reference:
/affected/1/versions1:18.3-dfsg-1ubuntu3.1+esm2Source reference:
/affected/1/versions - Fixed versions
- 1:18.3-dfsg-1ubuntu3.1+esm3
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/2/package/name
- Affected versions
- 1:20.0.4+dfsg-1ubuntu1
Source reference:
/affected/2/versions1:20.1.2+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.1.3+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.1.4+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.1.5+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.1.6+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.1.7+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.2.1+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.2.2+dfsg-1ubuntu1Source reference:
/affected/2/versions1:20.2.2+dfsg-1ubuntu2Source reference:
/affected/2/versions1:20.2.2+dfsg-1ubuntu2+esm1Source reference:
/affected/2/versions1:20.2.2+dfsg-1ubuntu2+esm2Source reference:
/affected/2/versions - Fixed versions
- 1:20.2.2+dfsg-1ubuntu2+esm3
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/3/package/name
- Affected versions
- 1:22.0.7+dfsg-1build1
Source reference:
/affected/3/versions1:22.2+dfsg-1Source reference:
/affected/3/versions1:22.2.1+dfsg-1Source reference:
/affected/3/versions1:22.2.2+dfsg-1Source reference:
/affected/3/versions1:22.2.3+dfsg-1Source reference:
/affected/3/versions1:22.2.3+dfsg-2Source reference:
/affected/3/versions1:22.2.4+dfsg-1Source reference:
/affected/3/versions1:22.2.7+dfsg-1Source reference:
/affected/3/versions1:22.2.7+dfsg-1ubuntu0.2Source reference:
/affected/3/versions1:22.2.7+dfsg-1ubuntu0.3Source reference:
/affected/3/versions1:22.2.7+dfsg-1ubuntu0.4Source reference:
/affected/3/versions1:22.2.7+dfsg-1ubuntu0.5Source reference:
/affected/3/versions1:22.2.7+dfsg-1ubuntu0.5+esm1Source reference:
/affected/3/versions - Fixed versions
- 1:22.2.7+dfsg-1ubuntu0.5+esm2
Source reference:
/affected/3/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/4/package/name
- Affected versions
- 1:23.2.6+dfsg-1build1
Source reference:
/affected/4/versions1:24.1.1+dfsg-1Source reference:
/affected/4/versions1:24.1.4+dfsg-1Source reference:
/affected/4/versions1:24.1.5+dfsg-1Source reference:
/affected/4/versions1:24.1.5+dfsg-1ubuntu1Source reference:
/affected/4/versions1:24.2+dfsg-1Source reference:
/affected/4/versions1:24.2.1+dfsg-1Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.1Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.2Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.3Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.4Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.5Source reference:
/affected/4/versions1:24.2.1+dfsg-1ubuntu0.6Source reference:
/affected/4/versions - Fixed versions
- 1:24.2.1+dfsg-1ubuntu0.7
Source reference:
/affected/4/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/5/package/name
- Affected versions
- 1:25.2.3+dfsg-1
Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu1Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu3Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.1Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.2Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.3Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.4Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.5Source reference:
/affected/5/versions1:25.3.2.8+dfsg-1ubuntu4.6Source reference:
/affected/5/versions - Fixed versions
- 1:25.3.2.8+dfsg-1ubuntu4.7
Source reference:
/affected/5/ranges - Prerequisites
- Not stated in this record
erlang
Source reference: /affected/6/package/name
- Affected versions
- 1:27.3.4.1+dfsg-1build1
Source reference:
/affected/6/versions1:27.3.4.3+dfsg-1Source reference:
/affected/6/versions1:27.3.4.4+dfsg-1Source reference:
/affected/6/versions1:27.3.4.6+dfsg-1Source reference:
/affected/6/versions - Fixed versions
- 1:27.3.4.6+dfsg-1ubuntu0.1
Source reference:
/affected/6/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
}
]
}
],
"package": {
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
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"1:16.b.2-dfsg-1ubuntu1",
"1:16.b.2-dfsg-2ubuntu1",
"1:16.b.3-dfsg-1ubuntu1",
"1:16.b.3-dfsg-1ubuntu2",
"1:16.b.3-dfsg-1ubuntu2.1",
"1:16.b.3-dfsg-1ubuntu2.2",
"1:16.b.3-dfsg-1ubuntu2.2+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
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},
{
"binary_name": "erlang-asn1",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
"binary_name": "erlang-base",
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{
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{
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{
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},
{
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{
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{
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{
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{
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},
{
"binary_name": "erlang-erl-docgen",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-et",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
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{
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"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
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{
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{
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"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-inets",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-jinterface",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-manpages",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-megaco",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-mnesia",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-mode",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
"binary_name": "erlang-nox",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-parsetools",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-percept",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-pman",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-public-key",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
"binary_name": "erlang-reltool",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
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"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-src",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
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{
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{
"binary_name": "erlang-toolbar",
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},
{
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},
{
"binary_name": "erlang-tv",
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},
{
"binary_name": "erlang-typer",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-webtool",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-xmerl",
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}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
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{
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{
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},
{
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}
]
}
],
"package": {
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"1:18.0-dfsg-1ubuntu2",
"1:18.2-dfsg-2ubuntu1",
"1:18.3-dfsg-1ubuntu1",
"1:18.3-dfsg-1ubuntu2",
"1:18.3-dfsg-1ubuntu3",
"1:18.3-dfsg-1ubuntu3.1",
"1:18.3-dfsg-1ubuntu3.1+esm1",
"1:18.3-dfsg-1ubuntu3.1+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
},
"ecosystem_specific": {
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{
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{
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{
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{
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{
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{
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{
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},
{
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},
{
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{
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{
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{
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{
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{
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},
{
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},
{
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},
{
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},
{
"binary_name": "erlang-manpages",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-megaco",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
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"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-mode",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-nox",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-parsetools",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-percept",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-public-key",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-reltool",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-snmp",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-src",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"binary_name": "erlang-test-server",
"binary_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
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},
{
"binary_name": "erlang-typer",
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},
{
"binary_name": "erlang-webtool",
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},
{
"binary_name": "erlang-wx",
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},
{
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},
{
"binary_name": "erlang-xmerl",
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}
],
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}
},
{
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}
],
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"1:20.2.1+dfsg-1ubuntu1",
"1:20.2.2+dfsg-1ubuntu1",
"1:20.2.2+dfsg-1ubuntu2",
"1:20.2.2+dfsg-1ubuntu2+esm1",
"1:20.2.2+dfsg-1ubuntu2+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "erlang",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-asn1",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
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},
{
"binary_name": "erlang-base-hipe",
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},
{
"binary_name": "erlang-common-test",
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{
"binary_name": "erlang-corba",
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},
{
"binary_name": "erlang-crypto",
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},
{
"binary_name": "erlang-debugger",
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},
{
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{
"binary_name": "erlang-diameter",
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},
{
"binary_name": "erlang-edoc",
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},
{
"binary_name": "erlang-eldap",
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},
{
"binary_name": "erlang-erl-docgen",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-et",
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},
{
"binary_name": "erlang-eunit",
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},
{
"binary_name": "erlang-examples",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-ic",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-ic-java",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-inets",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-jinterface",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-manpages",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-megaco",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-mnesia",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-mode",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-nox",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-parsetools",
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},
{
"binary_name": "erlang-public-key",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-reltool",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-snmp",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-src",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-syntax-tools",
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},
{
"binary_name": "erlang-tools",
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},
{
"binary_name": "erlang-wx",
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},
{
"binary_name": "erlang-x11",
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},
{
"binary_name": "erlang-xmerl",
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],
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}
},
{
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{
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{
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{
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]
}
],
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"1:22.2+dfsg-1",
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"1:22.2.2+dfsg-1",
"1:22.2.3+dfsg-1",
"1:22.2.3+dfsg-2",
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"1:22.2.7+dfsg-1ubuntu0.5",
"1:22.2.7+dfsg-1ubuntu0.5+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
},
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{
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{
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},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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],
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},
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55953.json"
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{
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]Publisher severity
No explicit severity was provided.
- Event
- #23729 · Revision 1
- Added to Heist Feed
- Publisher date