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Vulnerability record · CVE-2026-91768 · published 25 September 2026

CVE-2026-91768: Php vulnerability

Php · Php

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.

6.5 CVSS 3.1 Medium EPSS 0.38% · top 67.9% CWE-1023 · CWE-1023
6.5CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
27 Oct 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637 Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-91768), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.