Heap Buffer Overflow in PHP Affects Multiple Versions
CVE-2025-14178

6.5MEDIUM

Key Information:

Vendor

PHP Group

Status
PHP
Vendor
CVE Published:
27 December 2025

What is CVE-2025-14178?

A heap buffer overflow vulnerability has been identified in specific versions of PHP that occurs in the array_merge() function when the total element count of packed arrays exceeds 32-bit limits or HT_MAX_SIZE. This issue is triggered by an integer overflow during the precomputation of element counts using zend_hash_num_elements(). The vulnerability poses a risk of memory corruption or server crashes, ultimately affecting the integrity and availability of the targeted server.

Affected Version(s)

PHP 8.1.*

PHP 8.1.* < 8.1.34

PHP 8.2.* < 8.2.30

References

https://github.com/php/php-src/security/advisories/GHSA-h...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Niels Dossche
JSON
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CVE-2025-14178 : Heap Buffer Overflow in PHP Affects Multiple Versions