IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcmp 12 bytes)

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Affected scope and exposure questions

The current feed maps PHP Group/PHP (generic). Check affected ranges and fixed versions before updating.

Recommended response

1. 1Check inventory. Check lockfiles and deployed manifests for PHP Group/PHP.
2. 2Review the reported fix. Update PHP Group/PHP to 8.2.34 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

1. Published upstream

   Sep 25, 2026

   Evidence: source:cvelist:source_dates:source-dates:record

2. Source modified

   Sep 25, 2026

   Evidence: source:cvelist:source_dates:source-dates:record

3. First seen by HOL

   Sep 25, 2026

Sources and claim methodology

• GitHub security advisorygithub.com

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