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CVE-2026-91767

nvd nist
Published: Sep 25, 2026Modified: Oct 27, 2026

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6.5
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability: 2.8 / Impact: 3.6
Source: NVD

Description

php_openssl_matches_wildcard_name() in ext/openssl/xp_ssl.c underflows the length argument passed to memchr() when a TLS server certificate presents a wildcard name whose literal characters are together longer than the hostname being verified. A malicious server presenting such a certificate makes the PHP client read up to SIZE_MAX bytes past the end of a heap allocation. The path is reachable from any default client stream, because verify_peer_name is enabled by default.

Affected (4)

Products: Php: Php
Php
1 product
Php
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Php
Php
8.2.0 ≤ version < 8.2.34
Php
8.3.0 ≤ version < 8.3.35
Php
8.4.0 ≤ version < 8.4.26
Php
8.5.0 ≤ version < 8.5.11

Related CWEs

CWE-122
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (1)

Source: security@php.net
Vendor Advisory

Timeline

No history available yet.