VulnerabilityModified
CVE-2025-6491
This may lead to crashes and affect the availability of the target server.
MEDIUM 5.9EPSS 0.97%
Does this matter?
Lower severity and a low EPSS score (0.97%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.97% probability · 60th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- php/php
- Source
- security@php.net
References
- https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8xExploit, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2025/07/11/4
- https://lists.debian.org/debian-lts-announce/2025/07/msg00017.html
- https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8xExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.