What is CVE-2026-26081?

CVE-2026-26081 is a medium-severity vulnerability in Haproxy Aloha, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 4.8/10. Published 2026-07-20.

How severe is CVE-2026-26081?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Haproxy Aloha

CVE-2026-26081

HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.

Published 2026-07-20 · last modified 2026-08-25.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.005 (40.2th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Haproxy Aloha
Haproxy — versions 3.0, 3.1, 3.2
Haproxy Enterprise — versions 3.0r1, 3.1r1, 3.2r1

Weakness classification (CWE)

CWE-130 — Improper Handling of Length Parameter Inconsistency

References

git.haproxy.org/ (Patch, Vendor Advisory)
www.haproxy.org (Product)

Frequently asked questions

What is CVE-2026-26081?: CVE-2026-26081 is a medium-severity vulnerability in Haproxy Aloha, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 4.8/10. Published 2026-07-20.
How severe is CVE-2026-26081?: Medium severity. CVSS v3 base score is 4.8 out of 10.