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HAProxy 3.0 vulnerabilities

6 known CVEs affect the 3.0 line of HAProxy.

9.0 max CVSS

Fixed in

3.0.43.0.123.0.163.0.24
Check your versionhaproxy -v

CVEs affecting 3.0

CVE Title CVSS Exploited EPSS Published
CVE-2026-55203 HAProxy - Integer Overflow in FCGI Demux Record Length Field 9.0 — 2026-06-19
CVE-2026-55204 HAProxy - NULL Pointer Dereference in hpack_dht_insert Function 8.7 — 2026-06-19
CVE-2024-45506 HAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service... 7.5 — 2024-09-04
CVE-2025-11230 Denial of service vulnerability in HAProxy mjson library 7.5 — 2025-11-19
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... 4.8 — 2026-07-20
CVE-2026-33555 An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body lengt... 4.0 — 2026-04-13

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Weekly exploited-vulnerability digest

The KEV additions that matter for self-hosted servers, once a week. No other mail.

Data: CVE List (CVE® Program), NVD, CISA KEV, FIRST EPSS (see EPSS at https://www.first.org/epss), endoflife.date. Software list: awesome-selfhosted (CC BY-SA 3.0).