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

CVE ID : CVE-2025-14178

Published : Dec. 27, 2025, 7:27 p.m. | 55 minutes ago

Description : 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.

Severity: 6.5 | MEDIUM

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