CVE-2025-14178

Heap buffer overflow in array_merge()

State: Published
Severity: 6.5 Medium
Published: Dec 27, 2025
Updated: Jan 24, 2026
Reserved: Dec 6, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H	php

Weaknesses

CWE-787 Out-of-bounds Write
CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
PHPPHP Group	8.1.* to before 8.1.34Affected 8.2.* to before 8.2.30Affected 8.3.* to before 8.3.29Affected 8.4.* to before 8.4.16Affected 8.5.* to before 8.5.1Affected

References

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