CVE-2025-6491 – Apache PHP SOAP XML Namespace Prefix Overflow Vulnerability

The following table lists the changes that have been made to the
CVE-2025-6491 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Jul. 13, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-476
    Added Reference https://github.com/php/php-src/security/advisories/GHSA-453j-q27h-5p8x
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