Denial of service vulnerability in HAProxy mjson library

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-11230
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-19 10:15:45 UTC
Updated2026-10-18 20:10:00 UTC
DescriptionInefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially crafted JSON requests.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-407 | CWE-407 CWE-407 Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Haproxy Aloha Appliance All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA HAProxy Technologies HAProxy Community Edition affected 2.4.0 2.4.30 semver Not specified
CNA HAProxy Technologies HAProxy Community Edition affected 2.6.0 2.6.23 semver Not specified
CNA HAProxy Technologies HAProxy Community Edition affected 2.8.0 2.8.16 semver Not specified
CNA HAProxy Technologies HAProxy Community Edition affected 3.0.0 3.0.12 semver Not specified
CNA HAProxy Technologies HAProxy Community Edition affected 3.1.0 3.1.9 semver Not specified
CNA HAProxy Technologies HAProxy Community Edition affected 3.2.0 3.2.6 semver Not specified

References

ReferenceSourceLinkTags
www.haproxy.com/blog/october-2025-cve-2025-11230-haproxy-mjson-library-denial... [email protected] www.haproxy.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report