CVE-2025-14178 MEDIUM

CVE-2025-14178: Heap buffer overflow in array_merge()

Vendor Php Group
Product PHP
Weakness CWE-787
Published December 27, 2025
Last update January 24, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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, a heap buffer overflow occurs in array_merge() when the total element count of packed arrays exceeds 32-bit limits or HT_MAX_SIZE, due to an integer overflow in the precomputation of element counts using zend_hash_num_elements(). This may lead to memory corruption or crashes and affect the integrity and availability of the target server.

Key dates

02Disclosure timeline

December 27, 2025 CVE published
January 24, 2026 Record updated