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.

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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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