ubuntu-cve-2026-42790
Vulnerability from osv_ubuntu
Published
2026-05-27 17:16
Modified
2026-06-30 16:21
Summary
Details
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 hostname matcher. This issue affects OTP from OTP 19.3 before OTP 26.2.5.21, 27.3.4.12, 28.5.0.1, and 29.0.1 corresponding to public_key from 1.4 before 1.15.1.7, 1.17.1.3, 1.20.3.1, and 1.21.1.
Severity
7.4 (High)
8.1 (High)
N/A (UNKNOWN)
References
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"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
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{
"binary_name": "erlang-public-key",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
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{
"binary_name": "erlang-reltool",
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{
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{
"binary_name": "erlang-snmp",
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},
{
"binary_name": "erlang-src",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tftp",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-wx",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-xmerl",
"binary_version": "1:27.3.4.1+dfsg-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang@1:27.3.4.1+dfsg-1ubuntu0.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "erlang",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-asn1",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-base",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-common-test",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-crypto",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-debugger",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-dialyzer",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-diameter",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-edoc",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-eldap",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-et",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-eunit",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-examples",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ftp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-inets",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-jinterface",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-megaco",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-mnesia",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-mode",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-nox",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-parsetools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-public-key",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-reltool",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-snmp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-src",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-tftp",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-wx",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:27.3.4.6+dfsg-1"
},
{
"binary_name": "erlang-xmerl",
"binary_version": "1:27.3.4.6+dfsg-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang@1:27.3.4.6+dfsg-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:27.3.4.1+dfsg-1build1",
"1:27.3.4.3+dfsg-1",
"1:27.3.4.4+dfsg-1",
"1:27.3.4.6+dfsg-1"
]
}
],
"aliases": [],
"details": "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 hostname matcher. This issue affects OTP from OTP 19.3 before OTP 26.2.5.21, 27.3.4.12, 28.5.0.1, and 29.0.1 corresponding to public_key from 1.4 before 1.15.1.7, 1.17.1.3, 1.20.3.1, and 1.21.1.",
"id": "UBUNTU-CVE-2026-42790",
"modified": "2026-06-30T16:21:00Z",
"published": "2026-05-27T17:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42790"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42790"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/security/advisories/GHSA-22cw-4ph4-6447"
},
{
"type": "REPORT",
"url": "https://cna.erlef.org/cves/CVE-2026-42790.html"
},
{
"type": "REPORT",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-42790"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/0769050c69d73762672b0db1347b6993a5b31759"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/fb67c6d1836f51105a96d8b769e71e4215a79457"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/21abed64eb2026b5f82f432709e4e932f9be389a"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/0769050c69d73762672b0db1347b6993a5b31759"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/21abed64eb2026b5f82f432709e4e932f9be389a"
},
{
"type": "REPORT",
"url": "https://github.com/erlang/otp/commit/fb67c6d1836f51105a96d8b769e71e4215a79457"
},
{
"type": "REPORT",
"url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42790"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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