CVE-2025-6491

Public Exploit
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.06%
Vendor Advisory github.com
Affected: PHP Group PHP
Published at:
Updated at:

References

Link Tags
https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x vendor advisory exploit

Frequently Asked Questions

What is the severity of CVE-2025-6491?
CVE-2025-6491 has been scored as a medium severity vulnerability.
How to fix CVE-2025-6491?
To fix CVE-2025-6491, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-6491 being actively exploited in the wild?
It is possible that CVE-2025-6491 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-6491?
CVE-2025-6491 affects PHP Group PHP.
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