CVE-2025-11230

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

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.7% chance of exploitation in the next 30 days; higher than 54% of CVEs (scores of 2026-10-25)

CWE

CWE-407

Published

2025-11-19

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• haproxy:aloha_appliance
• haproxy:haproxy
• haproxy:haproxy_enterprise
• haproxy:kubernetes_ingress_controller

References

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

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