CVE-2026-91769
Last modified
CVE-2026-91769 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.14% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Php | Php | >= 8.2.0, < 8.2.34 |
| Php | Php | >= 8.3.0, < 8.3.35 |
| Php | Php | >= 8.4.0, < 8.4.26 |
| Php | Php | >= 8.5.0, < 8.5.11 |
References
- https://github.com/php/php-src/security/advisories/GHSA-vvx9-73fr-5jjxVendor Advisory, Exploit
Timeline
- Published
- Last Modified
- Status
- Analyzed
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- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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