Vulnerability

CVE-2026-91768

Descriptive record received from OpenCTI and minimised for consultation in the Intel portal.

Sharing: PUBLIC-OSINT
Confidence: 100
Source: The CVE Program
Updated: 26/09/2026 05:09

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.

STIX identifiervulnerability--fd19861f-60cc-5067-b165-470e7262f42f

First observation-

Last observation-

Known relationships7

Aliases and classifications

CWE-1023

Minimised technical details

No raw data

cisa kev: False
cvss score: 6.5
cvss vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
cvss severity: MEDIUM

Provenance

Public references

vendor-advisory
https://github.com/php/php-src/security/advisories/GHSA-62xp-839h-2637

EudorIA correlation

Intel catalogue

The vulnerability is also available in the EudorIA editorial catalogue.

Open EudorIA analysis

Presence in OpenCTI describes an intelligence correlation and does not, by itself, constitute evidence of compromise, legal attribution or operational guidance applicable without context verification.