CVE-2025-6491

5.9 MEDIUM
Published: July 13, 2025 Modified: November 04, 2025
View on NVD

Description

In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x
Source: security@php.net
Exploit Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/07/11/4
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/07/msg00017.html
Source: af854a3a-2127-422b-91ae-364da2661108
https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.9 / 10.0
EPSS (Exploit Probability)
0.1%
34th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-476

Affected Vendors

php

Related CVEs

CVE-2026-21652 N/A
CVE-2026-21651 N/A
CVE-2026-21650 N/A
CVE-2026-21649 N/A
CVE-2026-21648 N/A