CVE-2025-14177 Affecting php-mbstring package, versions <0:8.0.30-5.el9_7


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.06% (19th percentile)

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  • Snyk IDSNYK-ALMALINUX9-PHPMBSTRING-15316751
  • published19 Feb 2026
  • disclosed2 Feb 2026

Introduced: 2 Feb 2026

CVE-2025-14177  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 php-mbstring to version 0:8.0.30-5.el9_7 or higher.
This issue was patched in ALSA-2026:2799.

NVD Description

Note: Versions mentioned in the description apply only to the upstream php-mbstring package and not the php-mbstring package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8.4.* before 8.4.16, 8.5.* before 8.5.1, the getimagesize() function may leak uninitialized heap memory into the APPn segments (e.g., APP1) when reading images in multi-chunk mode (such as via php://filter). This occurs due to a bug in php_read_stream_all_chunks() that overwrites the buffer without advancing the pointer, leaving tail bytes uninitialized. This may lead to information disclosure of sensitive heap data and affect the confidentiality of the target server.

CVSS Base Scores

version 3.1