MediumFix available
erlang — security advisory
Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass. On DTLS server startup, dtls_server_connection:initial_hello/3 initializes previous_cookie_secret to the empty binary (<<>>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext ClientHello can compute dtls_handshake:cookie(<<>>, IP, Port, Hello) and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext ClientHello can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses. This vulnerability is associated with program file lib/ssl/src/dtls_server_connection.erl and program routine dtls_server_connection:initial_hello/3. This issue affects OTP from OTP 20.0 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 8.2 before 11.7.3, 11.6.0.3 and 11.2.12.10.
- Products
- erlang
- Affected versions
- 1:20.0.4+dfsg-1ubuntu1, 1:20.1.2+dfsg-1ubuntu1, 1:20.1.3+dfsg-1ubuntu1, 1:20.1.4+dfsg-1ubuntu1, 1:20.1.5+dfsg-1ubuntu1, 1:20.1.6+dfsg-1ubuntu1, 1:20.1.7+dfsg-1ubuntu1, 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, 1:20.2.2+dfsg-1ubuntu2+esm3, 1:22.0.7+dfsg-1build1, 1:22.2+dfsg-1, 1:22.2.1+dfsg-1, 1:22.2.2+dfsg-1, 1:22.2.3+dfsg-1, 1:22.2.3+dfsg-2, 1:22.2.4+dfsg-1, 1:22.2.7+dfsg-1, 1:22.2.7+dfsg-1ubuntu0.2, 1:22.2.7+dfsg-1ubuntu0.3, 1:22.2.7+dfsg-1ubuntu0.4, 1:22.2.7+dfsg-1ubuntu0.5, 1:22.2.7+dfsg-1ubuntu0.5+esm1, 1:22.2.7+dfsg-1ubuntu0.5+esm2, 1:23.2.6+dfsg-1build1, 1:24.1.1+dfsg-1, 1:24.1.4+dfsg-1, 1:24.1.5+dfsg-1, 1:24.1.5+dfsg-1ubuntu1, 1:24.2+dfsg-1, 1:24.2.1+dfsg-1, 1:24.2.1+dfsg-1ubuntu0.1, 1:24.2.1+dfsg-1ubuntu0.2, 1:24.2.1+dfsg-1ubuntu0.3, 1:24.2.1+dfsg-1ubuntu0.4, 1:24.2.1+dfsg-1ubuntu0.5, 1:24.2.1+dfsg-1ubuntu0.6, 1:24.2.1+dfsg-1ubuntu0.7, 1:25.2.3+dfsg-1, 1:25.3.2.8+dfsg-1, 1:25.3.2.8+dfsg-1ubuntu1, 1:25.3.2.8+dfsg-1ubuntu3, 1:25.3.2.8+dfsg-1ubuntu4, 1:25.3.2.8+dfsg-1ubuntu4.1, 1:25.3.2.8+dfsg-1ubuntu4.2, 1:25.3.2.8+dfsg-1ubuntu4.3, 1:25.3.2.8+dfsg-1ubuntu4.4, 1:25.3.2.8+dfsg-1ubuntu4.5, 1:25.3.2.8+dfsg-1ubuntu4.6, 1:25.3.2.8+dfsg-1ubuntu4.7, 1:27.3+dfsg-1ubuntu1, 1:27.3+dfsg-1ubuntu1.1, 1:27.3.4.1+dfsg-1, 1:27.3.4.1+dfsg-1build1, 1:27.3.4.1+dfsg-1ubuntu0.1, 1:27.3.4.3+dfsg-1, 1:27.3.4.4+dfsg-1, 1:27.3.4.6+dfsg-1, 1:27.3.4.6+dfsg-1ubuntu0.1
- Fixed versions
- 1:20.2.2+dfsg-1ubuntu2+esm4, 1:22.2.7+dfsg-1ubuntu0.5+esm3, 1:24.2.1+dfsg-1ubuntu0.8, 1:25.3.2.8+dfsg-1ubuntu4.8, 1:27.3.4.6+dfsg-1ubuntu0.2
- CVEs
- CVE-2026-54887
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:04 UTC · Revision 1
Source evidence
Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass. On DTLS server startup, dtls_server_connection:initial_hello/3 initializes previous_cookie_secret to the empty binary (<<>>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext ClientHello can compute dtls_handshake:cookie(<<>>, IP, Port, Hello) and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext ClientHello can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses. This vulnerability is associated with program file lib/ssl/src/dtls_server_connection.erl and program routine dtls_server_connection:initial_hello/3. This issue affects OTP from OTP 20.0 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 8.2 before 11.7.3, 11.6.0.3 and 11.2.12.10.
osv:UBUNTU-CVE-2026-54887
erlang
Fixed versions: 1:20.2.2+dfsg-1ubuntu2+esm4
erlang
Fixed versions: 1:22.2.7+dfsg-1ubuntu0.5+esm3
erlang
Fixed versions: 1:24.2.1+dfsg-1ubuntu0.8
erlang
Fixed versions: 1:25.3.2.8+dfsg-1ubuntu4.8
erlang
Fixed versions: Not specified
erlang
Fixed versions: 1:27.3.4.6+dfsg-1ubuntu0.2
Complete source record
{
"id": "37e33bdb7cfc71d64687aa21d70ece061790336c96c9774970338f027f86b89a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-54887",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-54887",
"summary": "Use of Default Cryptographic Key vulnerability in Erlang/OTP ssl (DTLS server) allows predictable DTLS cookie computation during the startup window, enabling source address verification bypass. On DTLS server startup, dtls_server_connection:initial_hello/3 initializes previous_cookie_secret to the empty binary (<<>>) instead of a random value. Because HMAC with an empty key is deterministic, anyone who observes the plaintext ClientHello can compute dtls_handshake:cookie(<<>>, IP, Port, Hello) and forge a valid DTLS cookie before the first rotation of the cookie secret. The DTLS cookie (RFC 6347 §4.2.1) is a denial-of-service mitigation that prevents spoofed source IPs from forcing the server to allocate state and perform expensive cryptographic operations; it is not an authentication mechanism. During the window from server startup until the first secret rotation (0 to 15 seconds), an attacker who can observe the plaintext ClientHello can bypass the source address verification, enabling DTLS handshake amplification with spoofed source addresses. This vulnerability is associated with program file lib/ssl/src/dtls_server_connection.erl and program routine dtls_server_connection:initial_hello/3. This issue affects OTP from OTP 20.0 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 8.2 before 11.7.3, 11.6.0.3 and 11.2.12.10.",
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"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-54887",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V4",
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{
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{
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{
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"database_specific": {
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},
"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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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54887.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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},
{
"binary_name": "erlang-ssh",
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},
{
"binary_name": "erlang-ssl",
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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-2026-54887.json"
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{
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"database_specific": {
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"ecosystem_specific": {
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],
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}
],
"modified": "2026-10-08T19:48:35.251330624Z",
"provider": "osv",
"upstream": [
"CVE-2026-54887"
],
"references": [
"https://ubuntu.com/security/CVE-2026-54887",
"https://www.cve.org/CVERecord?id=CVE-2026-54887",
"https://github.com/erlang/otp/security/advisories/GHSA-p2m2-3c2w-8jp8",
"https://cna.erlef.org/cves/CVE-2026-54887.html",
"https://osv.dev/vulnerability/EEF-CVE-2026-54887",
"https://github.com/erlang/otp/commit/888e3bcd72d5406016b9e0de741026bc2a6f114d",
"https://www.erlang.org/doc/system/versions.html#order-of-versions",
"https://ubuntu.com/security/notices/USN-8901-1"
]
},
"related_cves": [
{
"value": "CVE-2026-54887",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 104563,
"published_at": "2026-07-02T17:17:00+00:00"
}