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CVE-2026-91768 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1023	Incomplete Comparison with Missing Factors	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes