CVE-2025-11230

high-risk
Published 2025-11-19

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

Do I need to act?

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0.41% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Aloha Appliance
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise
Haproxy Enterprise

Affected Vendors

Haproxy

References (1)

Vendor Advisory https://www.haproxy.com/blog/october-2025-cve-2025-11230-haproxy-mjson-library-d...
61
/ 100
high-risk
Severity 26/34 · High
Exploitability 2/34 · Minimal
Exposure 33/34 · Critical