CVE-2025-14178
published 2025-12-27CVE-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…
PriorityP349high8.2CVSS 3.1
AVNACLPRNUINSUCNILAH
EPSS
0.46%
38.7th percentile
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
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | php7.4 | < php7.4 7.4.33-1+deb11u10 (bullseye) | php7.4 7.4.33-1+deb11u10 (bullseye) |
| debian | php8.2 | < php7.4 7.4.33-1+deb11u10 (bullseye) | php7.4 7.4.33-1+deb11u10 (bullseye) |
| debian | php8.4 | < php7.4 7.4.33-1+deb11u10 (bullseye) | php7.4 7.4.33-1+deb11u10 (bullseye) |
| msrc | azl3_php_8.3.23-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_php_8.3.29-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_php_8.1.33-1_on_cbl_mariner_2.0 | — | — |
| php | php | >= 8.1.0 < 8.1.34 | 8.1.34 |
| php | php | >= 8.2.0 < 8.2.30 | 8.2.30 |
| php | php | >= 8.3.0 < 8.3.29 | 8.3.29 |
| php | php | >= 8.4.0 < 8.4.16 | 8.4.16 |
| php | php | >= 8.5.0 < 8.5.1 | 8.5.1 |
| php_group | php | >= 8.1.* < 8.1.34 | 8.1.34 |
| php_group | php | >= 8.2.* < 8.2.30 | 8.2.30 |
| php_group | php | >= 8.3.* < 8.3.29 | 8.3.29 |
| php_group | php | >= 8.4.* < 8.4.16 | 8.4.16 |
| php_group | php | >= 8.5.* < 8.5.1 | 8.5.1 |
CVSS provenance
nvdv3.18.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
osv8.2HIGH
vendor_ubuntu7.5HIGH
vendor_debian6.5MEDIUM
vendor_msrc6.5MEDIUM
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
PHP vulnerabilities
vendor_ubuntu·2026-01-12·CVSS 7.5
CVE-2025-14180 [HIGH] PHP vulnerabilities
Title: PHP vulnerabilities
Summary: Several security issues were fixed in PHP.
It was discovered that PHP incorrectly handled memory while reading images
in multi-chunk mode. An attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 24.04 LTS, Ubuntu
25.04 and Ubuntu 25.10. (CVE-2025-14177)
It was discovered that PHP incorrectly handled memory when element count
exceeds 32-bit limit. An attacker could possibly use this issue to cause
a denial of service. (CVE-2025-14178)
It was discovered that PHP incorrectly handled memory when using the PDO
PostgreSQL driver. An attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu
24.04 LTS, Ubuntu 25.04 and Ubuntu 25.10. (CVE-2025-14180
Red Hat
php: heap-based buffer overflow in array_merge()
vendor_redhat·2025-12-27·CVSS 6.5
CVE-2025-14178 [MEDIUM] CWE-787 php: heap-based buffer overflow in array_merge()
php: heap-based buffer overflow in array_merge()
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.
A flaw was found in PHP. A heap-based buffer overflow occurs in the array_merge function when the total element count of packed arrays exceeds the 32-bit limit or the internal HT_MAX_SIZE due to an integer overflow in the precomputation of element counts using the zend_hash_num_elements f
Microsoft
Heap buffer overflow in array_merge()
vendor_msrc·2025-12-09·CVSS 6.5
CVE-2025-14178 [MEDIUM] CWE-787 Heap buffer overflow in array_merge()
Heap buffer overflow in array_merge()
Mariner: Mariner
php: php
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade
Debian
CVE-2025-14178: php7.4 - In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8...
vendor_debian·2025·CVSS 6.5
CVE-2025-14178 [MEDIUM] CVE-2025-14178: php7.4 - In PHP versions:8.1.* before 8.1.34, 8.2.* before 8.2.30, 8.3.* before 8.3.29, 8...
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.
Scope: local
bullseye: resolved (fixed in 7.4.33-1+deb11u10)
OSV
php7.2, php7.4, php8.1, php8.3, php8.4 vulnerabilities
osv·2026-01-12·CVSS 6.3
CVE-2025-14177 [MEDIUM] php7.2, php7.4, php8.1, php8.3, php8.4 vulnerabilities
php7.2, php7.4, php8.1, php8.3, php8.4 vulnerabilities
It was discovered that PHP incorrectly handled memory while reading images
in multi-chunk mode. An attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 24.04 LTS, Ubuntu
25.04 and Ubuntu 25.10. (CVE-2025-14177)
It was discovered that PHP incorrectly handled memory when element count
exceeds 32-bit limit. An attacker could possibly use this issue to cause
a denial of service. (CVE-2025-14178)
It was discovered that PHP incorrectly handled memory when using the PDO
PostgreSQL driver. An attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu
24.04 LTS, Ubuntu 25.04 and Ubuntu 25.10. (CVE-2025-14180)
OSV
CVE-2025-14178: In PHP versions:8
osv·2025-12-27·CVSS 8.2
CVE-2025-14178 [HIGH] CVE-2025-14178: In PHP versions:8
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.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2025-14178 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2025-14178 [MEDIUM] CVE-2025-14178 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-14178 :
PHP vulnerability analysis and mitigation
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.
Source : NVD
## 8.2
Score
Published December 27, 2025
Severity HIGH
CNA Score 6.5
Affected Technologies
PHP
Rocky Linux
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 5.9
Bugzilla
CVE-2025-14178 php: heap-based buffer overflow in array_merge()
bugzilla·2025-12-27·CVSS 8.2
CVE-2025-14178 [HIGH] CVE-2025-14178 php: heap-based buffer overflow in array_merge()
CVE-2025-14178 php: heap-based buffer overflow in array_merge()
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.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9.4 Extended Update Support
Via RHSA-2026:1169 https://access.redhat.com/errata/RHSA-2026:1169
---
This issue has been addressed in the following products:
Red Hat Enterprise
2025-12-27
Published