Denial of Service Vulnerability in HAProxy's mjson Library
CVE-2025-11230

7.5HIGH

Key Information:

Vendor

Haproxy Technologies

Status
Haproxy Community Edition
Vendor
CVE Published:
19 November 2025

What is CVE-2025-11230?

An inefficiency in algorithm complexity within the mjson library of HAProxy enables remote attackers to exploit this vulnerability by sending specially crafted JSON requests. This can lead to a denial of service, overwhelming the application and potentially causing significant disruptions. Organizations using affected versions should consider applying patches and implementing robust security practices to mitigate the risk.

Affected Version(s)

HAProxy Community Edition 2.4.0 < 2.4.30

HAProxy Community Edition 2.6.0 < 2.6.23

HAProxy Community Edition 2.8.0 < 2.8.16

References

https://www.haproxy.com/blog/october-2025-cve-2025-11230-...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-11230 : Denial of Service Vulnerability in HAProxy's mjson Library