CVE-2025-14178

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.

CVSS 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-25)

CWEs

CWE-190, CWE-787

Published

2025-12-27

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

Affected

• php:php

References

• https://github.com/php/php-src/security/advisories/GHSA-h96m-rvf9-jgm2
• https://lists.debian.org/debian-lts-announce/2026/01/msg00019.html

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