Description
An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.
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 | 2.2.16-1 | — |
| Debian 13 | haproxy | 2.2.16-1 | — |
| Debian 12 | haproxy | 2.2.16-1 | — |
| Debian 11 | haproxy | 2.2.9-2+deb11u1 | DSA-4960-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenShift 4 | haproxy | 2.2.13-2.el7 | RHSA-2021:5208, RHSA-2021:4118 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | haproxy | 2.4.4+git0.acb1d0bea-1.2 | openSUSE-SU-2024:10839-1 |
Advisories 5
- DSA-4960-1 haproxy - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10839-1 haproxy-2.4.4+git0.acb1d0bea-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:5208 Red Hat Security Advisory: OpenShift Container Platform 4.8.25 security update Red Hat Security Advisories (RHSA) · Dec 18, 2025
- RHSA-2021:4118 Red Hat Security Advisory: OpenShift Container Platform 4.9.6 packages and security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- WID-SEC-2023-2456 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 27, 2023
References
- https://www.mail-archive.com/haproxy%40formilux.org/msg41041.html
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=a495e0d94876c9d39763db319f609351907a31e8
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=4b8852c70d8c4b7e225e24eb58258a15eb54c26e
- DSA-4960 vendor-advisory
- FEDORA-2021-e6557245e8 vendor-advisory
- FEDORA-2021-3ab4512c98 vendor-advisory