Vulnerability · Published Nov 19, 2025 · Assigned by canonical
CVE-2025-11230Denial of service vulnerability in HAProxy mjson library
High 7.5
In plain English
A high-severity security flaw in HAProxy Community Edition from HAProxy Technologies. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | haproxy | 3.0.5-4.el10_1.1 | ALSA-2025:21691 |
| AlmaLinux:9 | haproxy | 2.8.14-1.el9_7.1 | ALSA-2025:21693 |
| Debian:12 | haproxy | 2.6.12-1+deb12u3 | DEBIAN-CVE-2025-11230 |
| Debian:12 | haproxy | 2.6.12-1+deb12u3 | DSA-6017-1 |
| Debian:13 | haproxy | 3.0.11-1+deb13u1 | DSA-6017-1 |
| Debian:13 | haproxy | 3.0.11-1+deb13u1 | DEBIAN-CVE-2025-11230 |
| Debian:14 | haproxy | 3.2.5-2 | DEBIAN-CVE-2025-11230 |
| Rocky Linux:10 | haproxy | 0:3.0.5-4.el10_1.1 | RLSA-2025:21691 |
| Rocky Linux:9 | haproxy | 0:2.8.14-1.el9_7.1 | RLSA-2025:21693 |
| Ubuntu:22.04:LTS | haproxy | 2.4.24-0ubuntu0.22.04.3 | UBUNTU-CVE-2025-11230 |
| Ubuntu:22.04:LTS | haproxy | 2.4.24-0ubuntu0.22.04.3 | USN-7805-1 |
| Ubuntu:24.04:LTS | haproxy | 2.8.5-1ubuntu3.4 | UBUNTU-CVE-2025-11230 |
| Ubuntu:24.04:LTS | haproxy | 2.8.5-1ubuntu3.4 | USN-7805-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| HAProxy Technologies | HAProxy Community Edition | 2.4.0 – before 2.4.302.6.0 – before 2.6.232.8.0 – before 2.8.163.0.0 – before 3.0.123.1.0 – before 3.1.93.2.0 – before 3.2.6 |
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H