Improper Certificate Validation Affecting php8.2-tidy-debuginfo package, versions <0:8.2.34-1.amzn2023.0.1


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-AMZN2023-PHP82TIDYDEBUGINFO-20849974
  • published13 Oct 2026
  • disclosed25 Sept 2026

Introduced: 25 Sep 2026

NewCVE-2026-91769  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 php8.2-tidy-debuginfo to version 0:8.2.34-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-3161.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php8.2-tidy-debuginfo package and not the php8.2-tidy-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1