UBUNTU-CVE-2026-23941
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling. This vulnerability is associated with program files lib/inets/src/http_server/httpd_request.erl and program routines httpd_request:parse_headers/7. The server does not reject or normalize duplicate Content-Length headers. The earliest Content-Length in the request is used for body parsing while common reverse proxies (nginx, Apache httpd, Envoy) honor the last Content-Length value. This violates RFC 9112 Section 6.3 and allows front-end/back-end desynchronization, leaving attacker-controlled bytes queued as the start of the next request. This issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5.
UBUNTU-CVE-2026-23941
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-2026-23941
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+dfsg-1ubuntu1
Source reference:
/affected/6/versions1:27.3+dfsg-1ubuntu1.1Source reference:
/affected/6/versions1:27.3.4.1+dfsg-1Source reference:
/affected/6/versions1:27.3.4.1+dfsg-1build1Source reference:
/affected/6/versions1:27.3.4.1+dfsg-1ubuntu0.1Source reference:
/affected/6/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
erlang
Source reference: /affected/7/package/name
- Affected versions
- 1:27.3.4.1+dfsg-1build1
Source reference:
/affected/7/versions1:27.3.4.3+dfsg-1Source reference:
/affected/7/versions1:27.3.4.4+dfsg-1Source reference:
/affected/7/versions1:27.3.4.6+dfsg-1Source reference:
/affected/7/versions - Fixed versions
- 1:27.3.4.6+dfsg-1ubuntu0.1
Source reference:
/affected/7/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": [
"1:16.b.1-dfsg-4ubuntu1",
"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-2026-23941.json"
},
"ecosystem_specific": {
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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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},
{
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"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
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{
"binary_name": "erlang-edoc",
"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-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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"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"
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{
"binary_name": "erlang-odbc",
"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-parsetools",
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},
{
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"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-pman",
"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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},
{
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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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},
{
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},
{
"binary_name": "erlang-webtool",
"binary_version": "1:16.b.3-dfsg-1ubuntu2.2+esm2"
},
{
"binary_name": "erlang-x11",
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},
{
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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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},
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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-2026-23941.json"
},
"ecosystem_specific": {
"binaries": [
{
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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_version": "1:18.3-dfsg-1ubuntu3.1+esm3"
},
{
"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"
},
{
"binary_name": "erlang-mnesia",
"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"
},
{
"binary_name": "erlang-tools",
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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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{
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]
}
],
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"1:20.1.4+dfsg-1ubuntu1",
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"1:20.1.6+dfsg-1ubuntu1",
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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-2026-23941.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"
},
{
"binary_name": "erlang-base",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-base-hipe",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"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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},
{
"binary_name": "erlang-dialyzer",
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},
{
"binary_name": "erlang-diameter",
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},
{
"binary_name": "erlang-edoc",
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},
{
"binary_name": "erlang-eldap",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"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",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"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",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:20.2.2+dfsg-1ubuntu2+esm3"
},
{
"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",
"1:22.2.4+dfsg-1",
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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-2026-23941.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "erlang",
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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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{
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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-2026-23941.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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{
"binary_name": "erlang-syntax-tools",
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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-2026-23941.json"
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{
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{
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]Publisher severity
No explicit severity was provided.
- Event
- #23713 · Revision 1
- Added to Heist Feed
- Publisher date