# CVE-2025-11230: Denial of service vulnerability in HAProxy mjson library

CVE-2025-11230 is fixed in 2 products on 1 platform, first by haproxy 2.4.24-0ubuntu0.22.04.3, released October 1, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-11230
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 1, 2025
- Weakness: Inefficient Algorithmic Complexity
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-11230

## Description

Inefficient algorithm complexity in mjson in HAProxy allows remoteattackers to cause a denial of service via specially crafted JSON requests.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | haproxy Debian 12.15 (bookworm) | 2.6.12-1+deb12u3 | [DSA-6017-1](https://patchblox.com/security/data/fix/linux/dsa-6017-1.md) | Oct 3, 2025 |
| Linux | haproxy Debian 13.5 (trixie) | 3.0.11-1+deb13u1 | [DSA-6017-1](https://patchblox.com/security/data/fix/linux/dsa-6017-1.md) | Oct 3, 2025 |
| Linux | haproxy Debian 14 | 3.2.5-2 | [DEBIAN-CVE-2025-11230](https://patchblox.com/security/data/fix/linux/debian-cve-2025-11230.md) | Nov 19, 2025 |
| Linux | haproxy RHEL 10 | 3.0.5-4.el10_0.1 | [RHSA-2025:21692](https://patchblox.com/security/data/fix/linux/rhsa-2025-21692.md) | Oct 3, 2025 |
| Linux | haproxy RHEL 9 | 0:2.8.14-1.el9_7.1 | [RHSA-2025:21693](https://patchblox.com/security/data/fix/linux/rhsa-2025-21693.md) | Nov 18, 2025 |
| Linux | haproxy Ubuntu 22.04.1 LTS (jammy) | 2.4.24-0ubuntu0.22.04.3 | [haproxy 2.4.24-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-haproxy-2.4.24-0ubuntu0.22.04.3.md) | Oct 1, 2025 |
| Linux | haproxy Ubuntu 24.04.5 LTS (noble) | 2.8.5-1ubuntu3.4 | [haproxy 2.8.5-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-haproxy-2.8.5-1ubuntu3.4.md) | Oct 1, 2025 |
| Linux | haproxy Ubuntu 25.04 (plucky) | 3.0.8-1ubuntu1.2 | [haproxy 3.0.8-1ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-haproxy-3.0.8-1ubuntu1.2.md) | Oct 2, 2025 |
| Linux | haproxy almalinux 10 | 3.0.5-4.el10_1.1 | [ALSA-2025:21691](https://patchblox.com/security/data/fix/linux/alsa-2025-21691.md) | Nov 18, 2025 |
| Linux | haproxy almalinux 9 | 2.8.14-1.el9_7.1 | [ALSA-2025:21693](https://patchblox.com/security/data/fix/linux/alsa-2025-21693.md) | Nov 18, 2025 |
| Linux | haproxy ol 10 | 0:3.0.5-4.el10_1.1 | [ELSA-2025-21691](https://patchblox.com/security/data/fix/linux/elsa-2025-21691.md) | Dec 2, 2025 |
| Linux | haproxy ol 9 | 0:2.8.14-1.el9_7.1 | [ELSA-2025-21693](https://patchblox.com/security/data/fix/linux/elsa-2025-21693.md) | Nov 25, 2025 |
| Linux | haproxy opensuse-leap 15.6 | 2.8.11+git0.01c1056a4-150600.3.9.1 | [SUSE-SU-2025:03587-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03587-1.md) | Oct 13, 2025 |
| Linux | haproxy opensuse-leap 16.0 | 3.2.0+git0.e134140d2-160000.3.1 | [OPENSUSE-SU-2026:20032-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20032-1.md) | Jan 14, 2026 |
| Linux | haproxy rocky 10 | 0:3.0.5-4.el10_1.1 | [RLSA-2025:21691](https://patchblox.com/security/data/fix/linux/rlsa-2025-21691.md) | Nov 25, 2025 |
| Linux | haproxy rocky 9 | 0:2.8.14-1.el9_7.1 | [RLSA-2025:21693](https://patchblox.com/security/data/fix/linux/rlsa-2025-21693.md) | Nov 21, 2025 |
| Linux | haproxy sles 15.6 | 2.8.11+git0.01c1056a4-150600.3.9.1 | [SUSE-SU-2025:03587-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03587-1.md) | Oct 13, 2025 |
| Linux | haproxy sles 15.7 | 2.8.11+git0.01c1056a4-150600.3.9.1 | [SUSE-SU-2025:03587-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03587-1.md) | Oct 13, 2025 |
| Linux | haproxy sles 16.0 | 3.2.0+git0.e134140d2-160000.3.1 | [SUSE-SU-2026:20092-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20092-1.md) | Jan 14, 2026 |
| Linux | vim-haproxy Ubuntu 22.04.1 LTS (jammy) | 2.4.24-0ubuntu0.22.04.3 | [vim-haproxy 2.4.24-0ubuntu0.22.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-vim-haproxy-2.4.24-0ubuntu0.22.04.3.md) | Oct 1, 2025 |
| Linux | vim-haproxy Ubuntu 24.04.5 LTS (noble) | 2.8.5-1ubuntu3.4 | [vim-haproxy 2.8.5-1ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-vim-haproxy-2.8.5-1ubuntu3.4.md) | Oct 1, 2025 |
| Linux | vim-haproxy Ubuntu 25.04 (plucky) | 3.0.8-1ubuntu1.2 | [vim-haproxy 3.0.8-1ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-vim-haproxy-3.0.8-1ubuntu1.2.md) | Oct 2, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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