5.9
MEDIUM
CVE-2025-6491
Apache PHP SOAP XML Namespace Prefix Overflow Vulnerability
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.

INFO

Published Date :

July 13, 2025, 10:15 p.m.

Last Modified :

July 22, 2025, 4:51 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.2
Public PoC/Exploit Available at Github

CVE-2025-6491 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2025-6491 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Php php
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-6491.

URL Resource
https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x Exploit Vendor Advisory
https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x Exploit Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

DSA and DLA for Debian last 14 days

Python

Updated: 1 day, 9 hours ago
0 stars 0 fork 0 watcher
Born at : Feb. 12, 2025, 2:08 p.m. This repo has been linked 68 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-6491 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-6491 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jul. 22, 2025

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.1.0 up to (excluding) 8.1.33 *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.2.0 up to (excluding) 8.2.29 *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.3.0 up to (excluding) 8.3.23 *cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.4.0 up to (excluding) 8.4.10
    Added Reference Type CISA-ADP: https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x Types: Exploit, Vendor Advisory
    Added Reference Type PHP Group: https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x Types: Exploit, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jul. 14, 2025

    Action Type Old Value New Value
    Added Reference https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x
  • New CVE Received by [email protected]

    Jul. 13, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-476
    Added Reference https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-6491 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-6491 weaknesses.

CVSS31 - Vulnerability Scoring System
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