CVE-2025-14177: PHP

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• PHP PHP: from 8.1.0, before 8.1.34 (fixed in 8.1.34); from 8.2.0, before 8.2.30 (fixed in 8.2.30); from 8.3.0, before 8.3.29 (fixed in 8.3.29); from 8.4.0, before 8.4.16 (fixed in 8.4.16); version 8.5.0 only

Published 2025-12-27. Last modified 2026-06-17.