CVE-2025-6491

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

At a glance

Severity: MEDIUM 5.9
EPSS: EPSS 1.12 % · percentile 66 (2026-10-27)
State: PUBLISHED
Published: 2025-07-13
Updated: 2025-11-04
Assigner: php
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	php
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · security@php.net (Secondary)

Weaknesses (CWE)

CWE-476

European references

ENISA EUVD · EUVD-2025-21276
GCVE · GCVE-0-2025-6491

CERT-FR advisories

CERTFR-2025-AVI-0740 — Multiples vulnérabilités dans Tenable Security Center · cert.ssi.gouv.fr
CERTFR-2025-AVI-0558 — Multiples vulnérabilités dans PHP · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 8.1.0 < 8.1.33
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 8.2.0 < 8.2.29
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 8.3.0 < 8.3.23
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 8.4.0 < 8.4.10

Affected products

Product	Versions
PHP Group · PHP	affected 8.1.* < 8.1.33 ; affected 8.2.* < 8.2.29 ; affected 8.3.* < 8.3.23 ; affected 8.4.* < 8.4.10

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD