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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2026-91768

MEDIUM 6.5 CVSS 3.1
Published
September 25, 2026
Last modified
October 27, 2026
NVD status
Analyzed
Reported by
security@php.net
Weakness
CWE-1023
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so listen.allowed_clients matches on a /96 prefix instead of the exact address. An attacker who can source an address sharing the first 96 bits with an allowed one passes the check and reaches the FastCGI endpoint.

Affected products and versions

  • PHP — From 8.2.0 (including) to 8.2.34 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.35 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.26 (excluding)
  • PHP — From 8.5.0 (including) to 8.5.11 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637 Vendor Advisory
  • nvd.nist.gov Official NVD record