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

Quick assessment

Affected
HAProxy Technologies HAProxy Community Edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HAProxy是法国HAProxy公司的一款开源的TCP/HTTP负载均衡服务器。该服务器提供4层、7层代理，并能支持上万级别的连接，具有高效、稳定等特点。 HAProxy存在安全漏洞，该漏洞源于mjson中算法复杂度低效，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.69% · P52

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-11230

Vulnerability Information
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Vulnerability Title
Denial of service vulnerability in HAProxy mjson library
Source: CVE Program / CVE List V5
Vulnerability Description
Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
HAProxy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAProxy是法国HAProxy公司的一款开源的TCP/HTTP负载均衡服务器。该服务器提供4层、7层代理，并能支持上万级别的连接，具有高效、稳定等特点。 HAProxy存在安全漏洞，该漏洞源于mjson中算法复杂度低效，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
HAProxy Technologies HAProxy Community Edition 2.4.0 ~ 2.4.30 -

II. Public POCs for CVE-2025-11230

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III. Intelligence Information for CVE-2025-11230

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Security Blog Posts for CVE-2025-11230 (1)

IV. Related Vulnerabilities

Same vendor: HAProxy Technologies
Same weakness: CWE-407

V. Comments for CVE-2025-11230

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