CVE-2025-11230

CVE-2025-11230 is a high-severity vulnerability in Haproxy Aloha Appliance with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-407.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• EPSS exploit prediction: 0% (37th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2025-198149
• Weakness: CWE-407
• Affected product: Haproxy Aloha Appliance
• Published: 2025-11-19
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-11230?

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

How severe is CVE-2025-11230?

CVE-2025-11230 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-11230 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-11230?

CVE-2025-11230 primarily affects Haproxy Aloha Appliance. In total, 190 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-11230?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-11230 have an EU (EUVD) identifier?

Yes. CVE-2025-11230 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198149.

When was CVE-2025-11230 published?

CVE-2025-11230 was published on 2025-11-19 and last updated on 2026-06-17.

References

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

Affected products (190)

• cpe:2.3:a:haproxy:aloha_appliance:*:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-253.271:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-254.271:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-259.342:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-263.343:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-264.356:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.356:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.373:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.459:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.464:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.477:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.499:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.553:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.560:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.564:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-268.596:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-269.596:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-269.599:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-270.616:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-271.673:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-271.677:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-272.683:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-272.686:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-272.728:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-274.752:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-276.752:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-277.814:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-277.831:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-278.838:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.852:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.859:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.877:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.911:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.940:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.952:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.953:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-279.956:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-280.956:*:*:*:*:*:*
• cpe:2.3:a:haproxy:haproxy_enterprise:2.4r1:1.0.0-282.998:*:*:*:*:*:*

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