CVE-2025-14178
December 27, 2025
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.
Affected Packages
https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.3.0alpha1 <php-8.3.29Fix Suggestion:
Update to version php-8.3.29https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.1.0alpha1 <php-8.1.34Fix Suggestion:
Update to version php-8.1.34https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.5.0alpha1 <php-8.5.1Fix Suggestion:
Update to version php-8.5.1https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.4.0alpha1 <php-8.4.16Fix Suggestion:
Update to version php-8.4.16https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.2.0alpha1 <php-8.2.30Fix Suggestion:
Update to version php-8.2.30Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
EPSS
Base Score:
0.02
