CVE catalog
CVE-2026-110354
haproxy: CVE-2026-110354
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.81% · Oct 25, 2026
HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | haproxy | sid | 3.2.26-1 | fixed |
| Debian | haproxy | forky | 3.2.26-1 | fixed |
| Debian | haproxy | trixie | 3.0.11-1+deb13u3 | vulnerable |
| Debian | haproxy | trixie-security | 3.0.11-1+deb13u4 | fixed |
| Debian | haproxy | bookworm | 2.6.12-1+deb12u3 | vulnerable |
| Debian | haproxy | bookworm-security | 2.6.12-1+deb12u4 | fixed |
| Ubuntu | haproxy | pro | 1.7.9-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | pro | 1.7.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.4-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.7-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.4 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.6 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.7 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.8 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.9 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.10 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.11 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13+esm2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13+esm3 | vulnerable |
| Ubuntu | haproxy | pro | 1.7.9-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | pro | 1.7.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.4-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.7-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.4 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.6 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.7 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.8 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.9 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.10 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.11 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13+esm2 | vulnerable |
| Ubuntu | haproxy | pro | 1.8.8-1ubuntu0.13+esm3 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.5-1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.8-1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.9-1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.10-1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.10-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.11-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.12-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-2 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-2ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-2ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-2ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.13-2ubuntu0.5 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.29-0ubuntu1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.29-0ubuntu1.1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.29-0ubuntu1.3 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.31-0ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.31-0ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.31-0ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | 20.04 | 2.0.33-0ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.2.9-2ubuntu2 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.8-1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.8-2ubuntu3 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.11-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.12-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.12-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.13-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.14-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.18-0ubuntu1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.18-0ubuntu1.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.18-0ubuntu1.2 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.18-0ubuntu1.3 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.22-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.22-0ubuntu0.22.04.2 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.22-0ubuntu0.22.04.3 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.24-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.24-0ubuntu0.22.04.2 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.24-0ubuntu0.22.04.3 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.29-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.30-0ubuntu0.22.04.1 | vulnerable |
| Ubuntu | haproxy | 22.04 | 2.4.30-0ubuntu0.22.04.2 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.6.15-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu3 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu3.1 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu3.2 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu3.3 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.5-1ubuntu3.4 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.15-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.16-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.16-0ubuntu0.24.04.2 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.16-0ubuntu0.24.04.3 | vulnerable |
| Ubuntu | haproxy | 24.04 | 2.8.30-0ubuntu0.24.04.1 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.2.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.2.9-1ubuntu2.1 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.2.9-1ubuntu3 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.4.2-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.4.2-1ubuntu3 | vulnerable |
| Ubuntu | haproxy | 26.10 | 3.4.2-1ubuntu4 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.0.10-1ubuntu3 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.2.9-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.2.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.2.9-1ubuntu2.1 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.2.9-1ubuntu2.2 | vulnerable |
| Ubuntu | haproxy | 26.04 | 3.2.25-0ubuntu0.26.04.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | haproxy | source | sid | 3.2.26-1 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | forky | 3.2.26-1 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | trixie | 3.0.11-1+deb13u4 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | bookworm | 2.6.12-1+deb12u4 | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [haproxy]Affected
Details (4)
2.6.12-1+deb12u3· amd64 · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· arm64 · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· amd64 · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· arm64 · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
- [haproxy-doc]Affected
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
- [vim-haproxy]Affected
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookwormAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
2.6.12-1+deb12u3· all · bookworm-securityAffected · Fixed:
2.6.12-1+deb12u4dsa · haproxy · debian · 12; dsa · haproxy · debian · bookworm
[Debian 13 (Trixie)]
- [haproxy]Affected
Details (5)
3.0.11-1+deb13u3· amd64 · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixie-securityAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u4· amd64 · trixie-securityFixed · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
- [haproxy-doc]Affected
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
- [vim-haproxy]Affected
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityAffected · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
3.0.11-1+deb13u4dsa · haproxy · debian · 13
Observed:
References
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-110354]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-110354]
- [https://security-tracker.debian.org/tracker/CVE-2026-110354]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-110354.json]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]