CVE catalog
CVE-2019-18277
haproxy: CVE-2019-18277
- Severity
- Medium · CVSS 6.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 10.07% · Oct 25, 2026
A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).
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 | 16.04 | 1.5.14-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.5.15-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2ubuntu1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2ubuntu3 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.3 | fixed |
| Ubuntu | haproxy | 18.04 | 1.7.9-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.7.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.4-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.7-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.4 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.6 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.7 | fixed |
| Ubuntu | haproxy | 16.04 | 1.5.14-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.5.15-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2ubuntu1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.2-2ubuntu3 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 16.04 | 1.6.3-1ubuntu0.3 | fixed |
| Ubuntu | haproxy | 18.04 | 1.7.9-1ubuntu1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.7.9-1ubuntu2 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.4-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.7-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.1 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.2 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.3 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.4 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.6 | vulnerable |
| Ubuntu | haproxy | 18.04 | 1.8.8-1ubuntu0.7 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 | 2.0.10+git0.ac198b92-3.15.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 15 sp1 | 2.0.10+git0.ac198b92-8.8.1 | fixed |
| Opensuse | haproxy | leap 15.0 | 2.0.10+git0.ac198b92-lp150.2.16.1 | fixed |
| Suse | haproxy | hpe helion openstack 8 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | openstack cloud 7 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | openstack cloud 8 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | openstack cloud 9 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | openstack cloud crowbar 8 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | openstack cloud crowbar 9 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 12 sp3 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 12 sp4 | 1.6.11-11.3.1 | fixed |
| Suse | haproxy | linux enterprise high availability extension 12 sp5 | 1.6.11-11.3.1 | fixed |
| Opensuse | haproxy | leap 15.1 | 2.0.10+git0.ac198b92-lp151.2.6.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | haproxy | source | sid | 2.0.6-1 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | forky | 2.0.6-1 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | trixie | 2.0.6-1 | not yet assigned | Not reported | Not reported |
| Debian | haproxy | source | bookworm | 2.0.6-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | haproxy | deb | 16.04 | 1.6.3-1ubuntu0.3 | Not reported | USN-4174-1 | Not reported |
| Ubuntu | haproxy | deb | 18.04 | 1.8.8-1ubuntu0.7 | Not reported | USN-4174-1 | Not reported |
| Ubuntu | haproxy | deb | 16.04 | 1.6.3-1ubuntu0.3 | Not reported | UBUNTU-CVE-2019-18277 | Not reported |
| Ubuntu | haproxy | deb | 18.04 | 1.8.8-1ubuntu0.7 | Not reported | UBUNTU-CVE-2019-18277 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 | 2.0.10+git0.ac198b92-3.15.1 | Not reported | SUSE-SU-2019:3125-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 15 sp1 | 2.0.10+git0.ac198b92-8.8.1 | Not reported | SUSE-SU-2019:3126-1 | Not reported |
| Opensuse | haproxy | rpm | leap 15.0 | 2.0.10+git0.ac198b92-lp150.2.16.1 | Not reported | OPENSUSE-SU-2019:2626-1 | Not reported |
| Suse | haproxy | rpm | hpe helion openstack 8 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | openstack cloud 7 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | openstack cloud 8 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | openstack cloud 9 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | openstack cloud crowbar 8 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | openstack cloud crowbar 9 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 12 sp3 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 12 sp4 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Suse | haproxy | rpm | linux enterprise high availability extension 12 sp5 | 1.6.11-11.3.1 | Not reported | SUSE-SU-2019:3288-1 | Not reported |
| Opensuse | haproxy | rpm | leap 15.1 | 2.0.10+git0.ac198b92-lp151.2.6.1 | Not reported | OPENSUSE-SU-2019:2645-1 | 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:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· arm64 · bookwormFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· amd64 · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· arm64 · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
- [haproxy-doc]Unknown
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
- [vim-haproxy]Unknown
Source package: [haproxy]
Details (4)
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookwormFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
2.6.12-1+deb12u3· all · bookworm-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · bookworm; dsa · haproxy · debian · 12
[Debian 13 (Trixie)]
- [haproxy]Unknown
Details (5)
3.0.11-1+deb13u3· amd64 · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· amd64 · trixie-security · Historical versionFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· arm64 · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u4· amd64 · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
- [haproxy-doc]Unknown
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
- [vim-haproxy]Unknown
Source package: [haproxy]
Details (5)
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixieFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-security · Historical versionFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u3· all · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
3.0.11-1+deb13u4· all · trixie-securityFixed · Fixed:
2.0.6-1dsa · haproxy · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2020_1725.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2019-18277]
- [https://osv.dev/vulnerability/SUSE-SU-2019:3125-1]
- [https://osv.dev/vulnerability/SUSE-SU-2019:3126-1]
- [https://osv.dev/vulnerability/SUSE-SU-2019:3288-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2019-18277]
- [https://osv.dev/vulnerability/USN-4174-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2019:2626-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2019:2645-1]
- [https://security-tracker.debian.org/tracker/CVE-2019-18277]
- [https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-18277.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-0054.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]