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CVE-2025-6491

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CVE-2025-6491

Published: Jul 13, 2025

Modified: Nov 4, 2025

PUBLISHED

CVSS v3.1

5.9

MEDIUM

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.

VendorProductVersions

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

Weaknesses (CWE)

CWE-476

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

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