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CVE-2026-55203: haproxy before 2.4.36 (exclusive), from 2.5 (inclusive), before 2.6.30 (exclusive), from 2.7 (inclusive), before…
CVE-2026-55203. CVSS 3.1 base score 9.1 (CRITICAL, NVD). EPSS 0.00576 (percentile 0.45644), scored 2026-10-06.
Affected technology
haproxy · before 2.4.36 (exclusive)
haproxy
haproxy · from 2.5 (inclusive), before 2.6.30 (exclusive)
haproxy
haproxy · from 2.7 (inclusive), before 2.8.25 (exclusive)
haproxy
haproxy · from 2.9 (inclusive), before 3.0.24 (exclusive)
haproxy
haproxy · from 3.1 (inclusive), before 3.2.20 (exclusive)
haproxy
haproxy · from 3.3 (inclusive), before 3.4.1 (exclusive)
haproxy
haproxy · 0 through 3.4.0
haproxy
Description’s affected range: through 3.4.0, fixed in commit 5985276,
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required
What an attacker can do
Vendor/CNA’s CVSS 4.0 assessment (base score 9.0/10) rates confidentiality and availability impact as none; integrity impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.
- CWE
- CWE-190
- CCR priority
- 36.5 /100 (P4)
- CVSS 3.1
- 9.1 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H · NVD
- EPSS
- 0.00576 · percentile 0.45751 · 2026-10-08
- KEV
- no
Provenance
- FIRST EPSS daily exploit-probability · Source record · observed 2026-10-08 17:36:22.845483+00:00 UTC
- NVD CVE API 2.0 · Source record · observed 2026-10-08 17:32:11.049884+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-55203.html