MediumFix available
php8.2, php8.4 — security advisory
PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.
- Products
- php8.2, php8.4
- Affected versions
- 8.2.10-1, 8.2.10-2, 8.2.12-1, 8.2.16-1, 8.2.16-2, 8.2.17-1, 8.2.18-1, 8.2.18-1~deb12u1, 8.2.20-1~deb12u1, 8.2.20-2, 8.2.20-3, 8.2.21-1, 8.2.23-1, 8.2.24-1, 8.2.24-1~deb12u1, 8.2.26-1~deb12u1, 8.2.26-4, 8.2.27-1, 8.2.28-1~deb12u1, 8.2.29-1~deb12u1, 8.2.30-1~deb12u1, 8.2.31-1~deb12u1, 8.2.32-1~deb12u1, 8.2.33-1~deb12u1, 8.2.5-2, 8.2.7-1, 8.2.7-1.1, 8.2.7-1.2, 8.2.7-1~deb12u1, 8.4.11-1, 8.4.16-1, 8.4.16-1~deb13u1, 8.4.20-1, 8.4.21-1, 8.4.21-1~deb13u1, 8.4.22-1, 8.4.23-1, 8.4.23-1~deb13u1, 8.4.24-1, 8.4.24-1~deb13u1, 8.4.26-1~deb13u1
- Fixed versions
- 8.2.34-1~deb12u1, 8.4.26-1, 8.4.26-1~deb13u1
- CVEs
- CVE-2026-91769
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:10 UTC · Revision 1
Source evidence
PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.
osv:DEBIAN-CVE-2026-91769
php8.2
Fixed versions: 8.2.34-1~deb12u1
php8.4
Fixed versions: 8.4.26-1~deb13u1
php8.4
Fixed versions: 8.4.26-1
Complete source record
{
"id": "442ebac382bbc8d0337cc39e9bb7d0d58c7122fd57e06f17a8326404910aa101",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-91769",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-91769",
"summary": "PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry matches, falls back to the Common Name. RFC 6125 requires the CN to be ignored once the certificate presents any service identity, so a certificate carrying a non-matching DNS SAN was still accepted when its CN matched the requested peer_name. A certificate trusted by the client for one name can therefore be used to impersonate another.",
"evidence": "osv:DEBIAN-CVE-2026-91769",
"products": [
{
"name": {
"value": "php8.2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.2.34-1~deb12u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "8.2.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.10-2",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.16-2",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.17-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.18-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.18-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.20-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.20-2",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.20-3",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.21-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.23-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.24-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.24-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.26-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.26-4",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.28-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.29-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.30-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.31-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.32-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.33-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.7-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.7-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "8.2.7-1~deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "php8.4",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.4.26-1~deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "8.4.11-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.16-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.16-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.20-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.21-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.21-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.22-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.23-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.23-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.24-1",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.24-1~deb13u1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "php8.4",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "8.4.26-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "8.4.11-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.16-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.16-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.20-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.21-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.21-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.22-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.23-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.23-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.24-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.24-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.26-1~deb13u1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-91769",
"aliases": [
"DEBIAN-CVE-2026-91769"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.2.34-1~deb12u1"
}
]
}
],
"package": {
"name": "php8.2",
"purl": "pkg:deb/debian/php8.2?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"8.2.10-1",
"8.2.10-2",
"8.2.12-1",
"8.2.16-1",
"8.2.16-2",
"8.2.17-1",
"8.2.18-1",
"8.2.18-1~deb12u1",
"8.2.20-1~deb12u1",
"8.2.20-2",
"8.2.20-3",
"8.2.21-1",
"8.2.23-1",
"8.2.24-1",
"8.2.24-1~deb12u1",
"8.2.26-1~deb12u1",
"8.2.26-4",
"8.2.27-1",
"8.2.28-1~deb12u1",
"8.2.29-1~deb12u1",
"8.2.30-1~deb12u1",
"8.2.31-1~deb12u1",
"8.2.32-1~deb12u1",
"8.2.33-1~deb12u1",
"8.2.5-2",
"8.2.7-1",
"8.2.7-1.1",
"8.2.7-1.2",
"8.2.7-1~deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91769.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.26-1~deb13u1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1",
"8.4.21-1",
"8.4.21-1~deb13u1",
"8.4.22-1",
"8.4.23-1",
"8.4.23-1~deb13u1",
"8.4.24-1",
"8.4.24-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91769.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.4.26-1"
}
]
}
],
"package": {
"name": "php8.4",
"purl": "pkg:deb/debian/php8.4?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"8.4.11-1",
"8.4.16-1",
"8.4.16-1~deb13u1",
"8.4.20-1",
"8.4.21-1",
"8.4.21-1~deb13u1",
"8.4.22-1",
"8.4.23-1",
"8.4.23-1~deb13u1",
"8.4.24-1",
"8.4.24-1~deb13u1",
"8.4.26-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-91769.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-24T09:47:36.623860282Z",
"provider": "osv",
"upstream": [
"CVE-2026-91769"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-91769"
]
},
"related_cves": [
{
"value": "CVE-2026-91769",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429048,
"published_at": "2026-09-25T21:17:24.913+00:00"
}