High 7.5Published Nov 19, 2025

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

Updated under an hour ago (Oct 27, 2026, 8:23 AM ET)

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It affects HAProxy Technologies HAProxy Community Edition and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for HAProxy Technologies HAProxy Community Edition

Exploited in the last 30 days

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

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: canonical
NVD analysis: Analyzed
Record last updated: Nov 19, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

HAProxy Technologies HAProxy Community Edition haproxy_technologies:haproxy_community_edition (from the name)	from 2.4.0 before 2.4.30; from 2.6.0 before 2.6.23; from 2.8.0 before 2.8.16; from 3.0.0 before 3.0.12; from 3.1.0 before 3.1.9; from 3.2.0 before 3.2.6	CNA record
haproxy aloha_appliance haproxy:aloha_appliance	from 14.5.0 before 14.5.33; from 15.5.0 before 15.5.28; from 16.5.0 before 16.5.19; from 17.0.0 before 17.0.7	NVD
haproxy haproxy haproxy:haproxy	from 2.4.0 before 2.4.30; from 2.6.0 before 2.6.23; from 2.8.0 before 2.8.16; from 3.0.0 before 3.0.12; from 3.1.0 before 3.1.9; from 3.2.0 before 3.2.6	NVD
haproxy haproxy_enterprise haproxy:haproxy_enterprise	2.4r1; 2.4r1; 2.4r1; 2.4r1; 2.4r1; 2.4r1; 2.4r1; 2.4r1; and 178 more ranges	NVD
haproxy kubernetes_ingress_controller haproxy:kubernetes_ingress_controller	before 1.9.14-ee7; before 3.1.12; from 1.10.10-ee1 before 1.11.12-ee10; from 3.0.0-ee1 before 3.0.15-ee4	NVD

References

References

https://www.haproxy.com/blog/october-2025-cve-2025-11230-haproxy-mjson-library-denial-of-service-vulnerability	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.