HighFix available
erlang — security advisory
Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) allows a DNS nameConstraints bypass via subject CommonName fallback in TLS hostname verification. Two flaws combine to allow a subordinate CA whose DNS nameConstraints are restricted (e.g. permitted;DNS:allowed.example.com) to issue a leaf certificate that an OTP TLS client accepts as a valid identity for an out-of-scope hostname (e.g. victim.example.com): First, pubkey_cert:validate_names/6 in lib/public_key/src/pubkey_cert.erl only checks SAN DNS entries against nameConstraints. Per RFC 5280, a permitted DNS subtree only restricts certificates that contain a DNS-typed name. A leaf with no subjectAltName therefore trivially satisfies any permitted;DNS:... constraint regardless of its subject commonName. Second, public_key:pkix_verify_hostname/3 in lib/public_key/src/public_key.erl falls back to the subject commonName when no subjectAltName is present, extracting id-at-commonName attributes as presented IDs and matching them against the reference hostname. The strict pkix_verify_hostname_match_fun(https) matcher does not suppress this fallback. The result is that path validation accepts a CN-only leaf under a DNS-constrained intermediate (no SAN means the nameConstraints are not triggered), and hostname verification then accepts it via the CN fallback. The bypass is reachable from stock ssl:connect with verify_peer, a trusted CA, SNI, and the canonical strict https host
- 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-2026-42790
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:04 UTC · Revision 1
Source evidence
Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) allows a DNS nameConstraints bypass via subject CommonName fallback in TLS hostname verification. Two flaws combine to allow a subordinate CA whose DNS nameConstraints are restricted (e.g. permitted;DNS:allowed.example.com) to issue a leaf certificate that an OTP TLS client accepts as a valid identity for an out-of-scope hostname (e.g. victim.example.com): First, pubkey_cert:validate_names/6 in lib/public_key/src/pubkey_cert.erl only checks SAN DNS entries against nameConstraints. Per RFC 5280, a permitted DNS subtree only restricts certificates that contain a DNS-typed name. A leaf with no subjectAltName therefore trivially satisfies any permitted;DNS:... constraint regardless of its subject commonName. Second, public_key:pkix_verify_hostname/3 in lib/public_key/src/public_key.erl falls back to the subject commonName when no subjectAltName is present, extracting id-at-commonName attributes as presented IDs and matching them against the reference hostname. The strict pkix_verify_hostname_match_fun(https) matcher does not suppress this fallback. The result is that path validation accepts a CN-only leaf under a DNS-constrained intermediate (no SAN means the nameConstraints are not triggered), and hostname verification then accepts it via the CN fallback. The bypass is reachable from stock ssl:connect with verify_peer, a trusted CA, SNI, and the canonical strict https host
osv:UBUNTU-CVE-2026-42790
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": "9322d4686ed403af4cb9b8122a6419177a0b20979c8d043d656cdbaf2a1e4089",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42790",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-42790",
"summary": "Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and public_key modules) allows a DNS nameConstraints bypass via subject CommonName fallback in TLS hostname verification. Two flaws combine to allow a subordinate CA whose DNS nameConstraints are restricted (e.g. permitted;DNS:allowed.example.com) to issue a leaf certificate that an OTP TLS client accepts as a valid identity for an out-of-scope hostname (e.g. victim.example.com): First, pubkey_cert:validate_names/6 in lib/public_key/src/pubkey_cert.erl only checks SAN DNS entries against nameConstraints. Per RFC 5280, a permitted DNS subtree only restricts certificates that contain a DNS-typed name. A leaf with no subjectAltName therefore trivially satisfies any permitted;DNS:... constraint regardless of its subject commonName. Second, public_key:pkix_verify_hostname/3 in lib/public_key/src/public_key.erl falls back to the subject commonName when no subjectAltName is present, extracting id-at-commonName attributes as presented IDs and matching them against the reference hostname. The strict pkix_verify_hostname_match_fun(https) matcher does not suppress this fallback. The result is that path validation accepts a CN-only leaf under a DNS-constrained intermediate (no SAN means the nameConstraints are not triggered), and hostname verification then accepts it via the CN fallback. The bypass is reachable from stock ssl:connect with verify_peer, a trusted CA, SNI, and the canonical strict https host",
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"aliases": [
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"metrics": [
{
"type": "CVSS_V4",
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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42790.json"
},
"ecosystem_specific": {
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{
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{
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},
{
"binary_name": "erlang-inets",
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{
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{
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},
{
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},
{
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},
{
"binary_name": "erlang-observer",
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},
{
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},
{
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},
{
"binary_name": "erlang-parsetools",
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},
{
"binary_name": "erlang-public-key",
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},
{
"binary_name": "erlang-reltool",
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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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"1:22.2.7+dfsg-1ubuntu0.5+esm2"
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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42790.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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},
{
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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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}
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42790.json"
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],
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}
],
"modified": "2026-10-08T19:47:10.150117391Z",
"provider": "osv",
"upstream": [
"CVE-2026-42790"
],
"references": [
"https://ubuntu.com/security/CVE-2026-42790",
"https://www.cve.org/CVERecord?id=CVE-2026-42790",
"https://github.com/erlang/otp/security/advisories/GHSA-22cw-4ph4-6447",
"https://cna.erlef.org/cves/CVE-2026-42790.html",
"https://osv.dev/vulnerability/EEF-CVE-2026-42790",
"https://github.com/erlang/otp/commit/0769050c69d73762672b0db1347b6993a5b31759",
"https://github.com/erlang/otp/commit/fb67c6d1836f51105a96d8b769e71e4215a79457",
"https://github.com/erlang/otp/commit/21abed64eb2026b5f82f432709e4e932f9be389a",
"https://www.erlang.org/doc/system/versions.html#order-of-versions",
"https://ubuntu.com/security/notices/USN-8901-1"
]
},
"related_cves": [
{
"value": "CVE-2026-42790",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/2/score"
},
"source_id": "core-osv",
"document_id": 104546,
"published_at": "2026-05-27T17:16:00+00:00"
}