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 Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update PHP to version 8.1.33 or later.
- Update PHP to version 8.2.29 or later.
- Update PHP to version 8.3.23 or later.
- Update PHP to version 8.4.10 or later.
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 |
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.
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).
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