CVE catalog
CVE-2021-40346
haproxy: CVE-2021-40346
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 58.83% · Oct 25, 2026
An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.
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 | fixed |
| Debian | haproxy | trixie-security | 3.0.11-1+deb13u4 | fixed |
| Debian | haproxy | bookworm | 2.6.12-1+deb12u3 | fixed |
| Debian | haproxy | bookworm-security | 2.6.12-1+deb12u4 | fixed |
| 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 | fixed |
| 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 | fixed |
| Ubuntu | haproxy | 22.04 | 2.2.9-2ubuntu2 | fixed |
| Opensuse | haproxy | leap 15.3 | 2.0.14-11.11.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 sp2 | 2.0.14-11.11.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 sp3 | 2.0.14-11.11.1 | fixed |
| Opensuse | haproxy | leap 15.2 | 2.0.14-lp152.2.6.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 | 2.0.14-3.31.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 sp1 | 2.0.14-8.23.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | haproxy | source | sid | 2.2.16-3 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | forky | 2.2.16-3 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | trixie | 2.2.16-3 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | bookworm | 2.2.16-3 | not yet assigned | Not reported | Not reported |
| Ubuntu | haproxy | deb | 20.04 | 2.0.13-2ubuntu0.3 | Not reported | USN-5063-1 | Not reported |
| Ubuntu | haproxy | deb | 20.04 | 2.0.13-2ubuntu0.3 | Not reported | UBUNTU-CVE-2021-40346 | Not reported |
| Ubuntu | haproxy | deb | 22.04 | 2.2.9-2ubuntu2 | Not reported | UBUNTU-CVE-2021-40346 | Not reported |
| Opensuse | haproxy | rpm | leap 15.3 | 2.0.14-11.11.1 | Not reported | OPENSUSE-SU-2021:2975-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 sp2 | 2.0.14-11.11.1 | Not reported | SUSE-SU-2021:2975-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 sp3 | 2.0.14-11.11.1 | Not reported | SUSE-SU-2021:2975-1 | Not reported |
| Opensuse | haproxy | rpm | leap 15.2 | 2.0.14-lp152.2.6.1 | Not reported | OPENSUSE-SU-2021:1329-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 | 2.0.14-3.31.1 | Not reported | SUSE-SU-2021:3258-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 sp1 | 2.0.14-8.23.1 | Not reported | SUSE-SU-2021:3257-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [haproxy]Unknown
Details (4)
2.6.12-1+deb12u3· amd64 · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· arm64 · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· amd64 · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· arm64 · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
- [haproxy-doc]Unknown
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
- [vim-haproxy]Unknown
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
[Debian 13 (Trixie)]
- [haproxy]Unknown
Details (5)
3.0.11-1+deb13u3· amd64 · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u4· amd64 · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
- [haproxy-doc]Unknown
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
- [vim-haproxy]Unknown
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
2.2.16-3dsa · haproxy · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2021:4118]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2021_2975-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2021-40346]
- [https://osv.dev/vulnerability/DSA-4968-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:2975-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:3257-1]
- [https://osv.dev/vulnerability/SUSE-SU-2021:3258-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2021-40346]
- [https://osv.dev/vulnerability/USN-5063-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:1329-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2021:2975-1]
- [https://security-tracker.debian.org/tracker/CVE-2021-40346]
- [https://wid.cert-bund.de/.well-known/csaf/white/2021/wid-sec-w-2023-2456.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]