Home/CVE/Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via specially
CVE

CVE-2025-11230

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

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

HIGH · CVSS 7.5 EPSS 0.00468
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-407Inefficient Algorithmic Complexity
▤

Affected Products & Versions

11
haproxy aloha appliance>= 14.5.0 and < 14.5.33
haproxy aloha appliance>= 15.5.0 and < 15.5.28
haproxy aloha appliance>= 16.5.0 and < 16.5.19
haproxy aloha appliance>= 17.0.0 and < 17.0.7
haproxy>= 2.4.0 and < 2.4.30
haproxy>= 2.6.0 and < 2.6.23
haproxy>= 2.8.0 and < 2.8.16
haproxy>= 3.0.0 and < 3.0.12
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@ubuntu.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Nov 2025 · 10:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

20
suse-csafopenSUSE-SU-2026:20032-1
suse-csafSUSE-SU-2026:20092-1
suse-csafSUSE-SU-2026:20094-1
suse-csafSUSE-SU-2026:20109-1
msrcCVE-2025-11230
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.haproxy.com/blog/october-2025-cve-2025-11230-haproxy-mjson-library-denial-of-service-vulnerabilityVendor Advisory
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