Skip to content
fr Sign in
6.5 Medium

CVE-2026-91768 The IPv6 branch of the FastCGI client access check compares only the first 12 bytes of a 16-byte IPv6 address, so…

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

Product Affected versions Fixed in
PHP 8.5 earliest → < 8.5.11 8.5.11
PHP 8.4 earliest → < 8.4.26 8.4.26
PHP 8.3 earliest → < 8.3.35 8.3.35
PHP 8.2 earliest → < 8.2.34 8.2.34

References

Timeline

  1. Published
  2. Last modified

Other CVEs of PHP

The 103 CVEs of PHP →
CVE-2026-109619 RCE via stale global state 9.2 Critical CVE-2026-109618 RCE via OOM corruption 9.2 Critical CVE-2026-92842 The convert.base64-encode, convert.quoted-printable-encode and convert.quoted-printable-decode stream filters accept a… 5.9 Medium CVE-2026-91769 PHP's OpenSSL stream peer verification checks the certificate's subjectAltName entries first and, whenever no entry… 4.3 Medium
Track this CVE