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Vulnerabilities in the PHP language itself, and which PHP versions they affect.

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CVE-2025-6491

MEDIUM 5.9 CVSS 3.1
Published
July 13, 2025
Last modified
June 17, 2026
NVD status
Modified
Reported by
security@php.net
Weakness
CWE-476
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Affected products and versions

  • PHP — From 8.1.0 (including) to 8.1.33 (excluding)
  • PHP — From 8.2.0 (including) to 8.2.29 (excluding)
  • PHP — From 8.3.0 (including) to 8.3.23 (excluding)
  • PHP — From 8.4.0 (including) to 8.4.10 (excluding)

References

  • github.com https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x Exploit, Vendor Advisory
  • www.openwall.com http://www.openwall.com/lists/oss-security/2025/07/11/4
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/07/msg00017.html
  • nvd.nist.gov Official NVD record