CVE-2025-6491 Affecting php:7.4/libzip package, versions <0:1.6.1-1.module_el8.10.0+3935+28808425


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.99% (62nd percentile)

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  • Snyk IDSNYK-ALMALINUX8-PHP-15281810
  • published14 Feb 2026
  • disclosed27 Jan 2026

Introduced: 27 Jan 2026

CVE-2025-6491  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 php:7.4/libzip to version 0:1.6.1-1.module_el8.10.0+3935+28808425 or higher.
This issue was patched in ALSA-2026:2470.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php:7.4/libzip package and not the php:7.4/libzip package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1