CVE-2025-11230

HIGH

Published Nov 19, 2025 Modified Dec 19, 2025 CWE-407

Description

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

Is your site exposed to CVE-2025-11230?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-407 CWE-407

Affected Products

Vendor	Product	Versions
haproxy	aloha_appliance	14.5.0 — 14.5.33
haproxy	aloha_appliance	15.5.0 — 15.5.28
haproxy	aloha_appliance	16.5.0 — 16.5.19
haproxy	aloha_appliance	17.0.0 — 17.0.7
haproxy	haproxy	2.4.0 — 2.4.30
haproxy	haproxy	2.6.0 — 2.6.23
haproxy	haproxy	2.8.0 — 2.8.16
haproxy	haproxy	3.0.0 — 3.0.12
haproxy	haproxy	3.1.0 — 3.1.9
haproxy	haproxy	3.2.0 — 3.2.6
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	haproxy_enterprise	All
haproxy	kubernetes_ingress_controller	< 1.9.14-ee7
haproxy	kubernetes_ingress_controller	< 3.1.12
haproxy	kubernetes_ingress_controller	1.10.10-ee1 — 1.11.12-ee10
haproxy	kubernetes_ingress_controller	3.0.0-ee1 — 3.0.15-ee4

References

Advisories & Patches

https://www.haproxy.com/blog/october-2025-cve-2025-11230-haproxy-mjson-library-denial-of-service-vulnerability

Frequently Asked Questions

What is CVE-2025-11230? +

Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-11230? +

CVE-2025-11230 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-11230? +

CVE-2025-11230 affects products from haproxy, specifically: aloha_appliance, haproxy, haproxy_enterprise, kubernetes_ingress_controller. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11230? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-3276

unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating …

CVE-2026-55206

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, PackInfo._read() …

CVE-2026-65623

Inefficient Algorithmic Complexity vulnerability in mtrudel bandit allows unauthenticated remote denial of service via CPU exhaustion during WebSocket fragment reassembly. …

CVE-2026-40476

graphql-go is a Go implementation of GraphQL. In versions 15.31.4 and below, the OverlappingFieldsCanBeMerged validation rule performs O(n²) pairwise comparisons …

CVE-2026-58226

Inefficient Algorithmic Complexity vulnerability in elixir-mint hpax allows unauthenticated denial-of-service via unbounded HPACK integer decoding. hpax decodes HPACK variable-length integers …

CVE-2026-57480

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to …

Quick Facts

CVSS Score: 7.5
Severity: HIGH
Published: Nov 19, 2025

Scan for this vulnerability

Check if your website or infrastructure is affected by CVE-2025-11230.

Website Scan Port Scan

Browse CVEs

Critical High CISA KEV ! Most likely exploited →