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CVE-2025-14178

Heap buffer overflow in array_merge()

Published: Dec 27, 2025Updated: Jan 24, 2026 Sources: CVE List NVD BDUCWE-190
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.4%
Top 66.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-190CWE-787

Affected Products

phpphp
Dev Tool
OSS Libraries / generic-library
PHPPHP GroupOSS Libraries
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
phposs-projectUSOSS Librariesaka php language, pecl, pear
php grouposs-projectOSS Librariesaka php, pear
canonical ltd.commercialGBOperating Systemsaka canonical
red hat inc.commercialUSOperating Systemsaka red hat
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/php/php-src/security/advisories/GHSA-h96m-rvf9-jgm2
github.com
https://lists.debian.org/debian-lts-announce/2026/01/msg00019.html
lists.debian.org
https://github.com/php/php-src/commit/e6d7d34c1ae46281993036189e3bcb6528911ce8
github.com
and 9 more references View all →

Timeline

Published
Dec 27, 2025
Last Updated
Jan 24, 2026

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