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.
Published: 2025-07-13
Score: 5.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4254-1 php7.4 security update
Debian DSA Debian DSA DSA-5967-1 php8.2 security update
EUVD EUVD EUVD-2025-21276 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.
Ubuntu USN Ubuntu USN USN-7648-1 PHP vulnerabilities
Ubuntu USN Ubuntu USN USN-7648-2 PHP vulnerabilities
History

Tue, 04 Nov 2025 22:30:00 +0000

Type Values Removed Values Added
References

Mon, 03 Nov 2025 20:30:00 +0000

Type Values Removed Values Added
References

Tue, 22 Jul 2025 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.0006}

 epss

{'score': 0.00081}

Mon, 14 Jul 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 14 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.0006}

Sun, 13 Jul 2025 22:15:00 +0000

Type Values Removed Values Added
Description A vulnerability was found in PHP. If a SoapVar instance is created with a fully qualified name larger than 2G, this will cause a NULL pointer dereference resulting in a segmentation fault, leading to a denial of service. 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.
Title php: NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
Metrics epss

{}

Wed, 09 Jul 2025 00:30:00 +0000

Type Values Removed Values Added
Description A vulnerability was found in PHP. If a SoapVar instance is created with a fully qualified name larger than 2G, this will cause a NULL pointer dereference resulting in a segmentation fault, leading to a denial of service.
Title php: NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
Weaknesses CWE-476
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Subscriptions

Php Php
cve-icon MITRE

Status: PUBLISHED

Assigner: php

Published:

Updated: 2025-11-04T21:14:48.898Z

Reserved: 2025-06-22T03:05:22.008Z

Link: CVE-2025-6491

cve-icon Vulnrichment

Updated: 2025-11-04T21:14:48.898Z

cve-icon NVD

Status : Modified

Published: 2025-07-13T22:15:23.353

Modified: 2025-11-04T22:16:43.147

Link: CVE-2025-6491

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-07-05T00:00:00Z

Links: CVE-2025-6491 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-14T22:45:28Z

Weaknesses