Buffer overflow in Php
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.
Vulnerability class: Integer Overflow
EPSS: 0.004 (35.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
Affected products
Weakness classification (CWE)
References
- security@php.net (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-14178?
- CVE-2025-14178 is a medium-severity vulnerability in Php, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2025-12-27.
- How severe is CVE-2025-14178?
- Medium severity. CVSS v3 base score is 6.5 out of 10.