[ CVE-2026-91768 · Published 25 Sep 2026 ]
Vulnerability in PHP Group PHP
CVSS 6.5
EPSS <1%1 agency advisoryNo fix listed yet
[ Description ]Official 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.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1227
Multiple vulnerabilities in PHP Translated from French
Multiple vulnerabilities have been discovered in PHP. Some of them allow an attacker to cause remote denial of service, a breach of data confidentiality and a breach of data integrity.