Description
HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishandled. HAProxy Enterprise and ALOHA are also affected.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| HAProxy | HAProxy | 3.2 – < 3.2.12, 3.3 – < 3.3.3 | 3.2.12 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | haproxy | 3.2.11-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | haproxy | 3.0.25-0.1.1.hum1 | RHSA-2026:40938 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | haproxy | 3.2.12+git0.6011f448e-160000.1.1 | SUSE-SU-2026:20620-1 |
| SLES 16.0 | haproxy | 3.2.12+git0.6011f448e-160000.1.1 | SUSE-SU-2026:20616-1 |
| SLE Micro 6.2 | haproxy | 3.2.12+git0.6011f448e-160000.1.1 | SUSE-SU-2026:20557-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | haproxy | 3.2.12+git0.6011f448e-160000.1.1 | openSUSE-SU-2026:20290-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
Zeerg/haproxy-quic-cves-2026 ★ 0 · Oct 27, 2026
Reproducible lab and network PoCs for HAProxy QUIC CVE-2026-26080 and CVE-2026-26081
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 6
- RHSA-2026:40938 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Sep 6, 2026
- WID-SEC-2026-0410 HAProxy Enterprise, Community und ALOHA (QUIC): Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jul 21, 2026
- openSUSE-SU-2026:20290-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20620-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20616-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20557-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026