Description
Inconsistent interpretation of HTTP requests ('HTTP Request/Response Smuggling') issue exists in HAProxy. If this vulnerability is exploited, a remote attacker may access a path that is restricted by ACL (Access Control List) set on the product. As a result, the attacker may obtain sensitive information.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| HAProxy Project | HAProxy 2.6 | 2.6.18 and earlier | — |
| HAProxy Project | HAProxy 2.8 | 2.8.10 and earlier | — |
| HAProxy Project | HAProxy 2.9 | 2.9.9 and earlier | — |
| HAProxy Project | HAProxy 3.0 | 3.0.2 and earlier | — |
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 | 2.9.10-1 | — |
| Debian 13 | haproxy | 2.9.10-1 | — |
| Debian 12 | haproxy | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | haproxy | 2.8.5-1ubuntu3.2 | USN-7133-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | haproxy | 2.8.11+git0.01c1056a4-150600.3.3.1 | SUSE-SU-2024:4390-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | haproxy | 2.8.11+git0.01c1056a4-slfo.1.1_1.1 | SUSE-SU-2025:20230-1 |
| SLE Micro 6.0 | haproxy | 2.8.11+git0.01c1056a4-1.1 | SUSE-SU-2025:20101-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | haproxy | 2.8.11+git0.01c1056a4-150600.3.3.1 | SUSE-SU-2024:4390-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | haproxy | 2.8.3-1.amzn2023.0.1 | ALAS2023-2025-791 |
Advisories 6
- SUSE-SU-2025:20230-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20101-1 Security update for haproxy SUSE / openSUSE Security Updates · Mar 23, 2026
- USN-7133-1 haproxy vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
- WID-SEC-2024-3560 HAProxy: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Jun 3, 2025
- SUSE-SU-2024:4390-1 Security update for haproxy SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2023-2025-791 Moderate: haproxy security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jan 9, 2025
References
- https://www.haproxy.org/
- https://git.haproxy.org/?p=haproxy-2.6.git;a=commit;h=1afca10150ac3e4e2224055cc31b6f1e4a70efe2
- https://git.haproxy.org/?p=haproxy-2.8.git;a=commit;h=01c1056a44823c5ffb8f74660b32c099d9b5355b
- https://git.haproxy.org/?p=haproxy-2.9.git;a=commit;h=4bcaece344c8738dac1ab5bd8cc81e2a22701d71
- https://git.haproxy.org/?p=haproxy-3.0.git;a=commit;h=95a607c4b3af09be2a495b9c2872ea252ccff603
- https://jvn.jp/en/jp/JVN88385716/