CVE-2026-91769
EUVD-2026-8734625.09.2026, 21:17
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.Enginsight
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| php | php | 8.2.* ≤ 𝑥 < 8.2.34 | CNA |
| php | php | 8.3.* ≤ 𝑥 < 8.3.35 | CNA |
| php | php | 8.4.* ≤ 𝑥 < 8.4.26 | CNA |
| php | php | 8.5.* ≤ 𝑥 < 8.5.11 | CNA |
Debian Releases
Ubuntu Releases
Ubuntu Product | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| php5 |
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| php7.0 |
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| php7.2 |
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| php7.4 |
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| php8.1 |
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| php8.3 |
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| php8.5 |
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Common Weakness Enumeration
Vulnerability Media Exposure