Vulnerability/
BIT-haproxy-2025-11230

BIT-haproxy-2025-11230: Denial of service vulnerability in HAProxy mjson library

Published Nov 19, 2025

Updated

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

Affected Software

1 affected component

HAProxy mjson

Event History

Nov 19, 2025

CVE Published

via OSV·09:28 AM

Data Sourced

via OSV·09:28 AM

DescriptionSeverityWeakness

Frequently Asked Questions

What level of access does an attacker need to exploit this issue?

The issue is remotely exploitable with no privileges or user interaction required. An attacker needs to be able to send specially crafted JSON requests to a reachable use of the HAProxy mjson library.

What is the expected impact of a successful attack?

A successful attack can cause denial of service through inefficient algorithmic processing of crafted JSON. The provided severity vector indicates no confidentiality or integrity impact.

CVSS Score

7.5High

High Severity

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

Security Metrics

Risk Score43

Severityhigh(7.5)

CWE

407

Timeline

PublishedNov 19, 2025

Updated

References

Tags

agent/descriptionagent/first-publish-dateagent/typeagent/titleagent/sourceagent/referencesagent/severityagent/eventagent/weaknessagent/risk-scorecollector/osv-vulnerabilitysource/OSValias/BIT-haproxy-2025-11230anchor-related/ALSA-2025:21691anchor-related/ALSA-2025:21693anchor-related/SUSE-SU-2025:03587-1anchor-related/SUSE-SU-2025:03589-1anchor-related/SUSE-SU-2025:20872-1anchor-related/SUSE-SU-2025:20900-1anchor-related/SUSE-SU-2026:20092-1anchor-related/SUSE-SU-2026:20094-1anchor-related/SUSE-SU-2026:20109-1anchor-related/openSUSE-SU-2025:15599-1anchor-related/openSUSE-SU-2026:20032-1agent/last-modified-dateagent/guess-aiagent/tagsagent/softwarecombinevendor/haproxycanonical/haproxy mjson

Company

Resources

Contact

SecAlerts Pty Ltd.
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Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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