haproxy: HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1headers are inadvertently lost in some situat...
CVE-2023-25725 is fixed in 2 products on 1 platform, first by haproxy 1.8.8-1ubuntu0.13, released February 14, 2023. It is not reported as exploited. Patch Radar priority: High.
HAProxy before 2.7.3 may allow a bypass of access control because HTTP/1headers are inadvertently lost in some situations, aka "request smuggling."The HTTP header parsers in HAProxy may accept empty header field names,which could be used to truncate the list of HTTP headers and thus make someheaders disappear after being parsed and processed for HTTP/1.0 andHTTP/1.1. For HTTP/2 and HTTP/3, the impact is limited because the headersdisappear before being parsed and processed, as if they had not been sentby the client. The fixed versions are 2.7.3, 2.6.9, 2.5.12, 2.4.22, 2.2.29,and 2.0.31.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| haproxy · Debian 12.15 (bookworm) | 2.6.8-2 | DEBIAN-CVE-2023-25725 | Feb 14, 2023 |
| haproxy · Debian 13.5 (trixie) | 2.6.8-2 | DEBIAN-CVE-2023-25725 | Feb 14, 2023 |
| haproxy · Debian 14 | 2.6.8-2 | DEBIAN-CVE-2023-25725 | Feb 14, 2023 |
| haproxy · RHEL 9 | 0:2.4.17-3.el9_1.2 | RHSA-2023:1696 | Apr 11, 2023 |
| haproxy · Ubuntu 18.04.6 LTS (bionic) | 1.8.8-1ubuntu0.13 | haproxy 1.8.8-1ubuntu0.13 | Feb 14, 2023 |
| haproxy · Ubuntu 20.04 LTS (focal) | 2.0.29-0ubuntu1.3 | haproxy 2.0.29-0ubuntu1.3 | Feb 14, 2023 |
| haproxy · Ubuntu 22.04.1 LTS (jammy) | 2.4.18-0ubuntu1.2 | haproxy 2.4.18-0ubuntu1.2 | Feb 14, 2023 |
| haproxy · Ubuntu 24.10 (oracular) | 2.6.9-1ubuntu1 | haproxy 2.6.9-1ubuntu1 | Jan 16, 2026 |
| haproxy · almalinux 9 | 2.4.17-3.el9_1.2 | ALSA-2023:1696 | Apr 11, 2023 |
| haproxy · ol 9 | 0:2.4.17-3.el9_1.2 | ELSA-2023-1696 | Apr 11, 2023 |
| vim-haproxy · Ubuntu 18.04.6 LTS (bionic) | 1.8.8-1ubuntu0.13 | vim-haproxy 1.8.8-1ubuntu0.13 | Feb 14, 2023 |
| vim-haproxy · Ubuntu 20.04 LTS (focal) | 2.0.29-0ubuntu1.3 | vim-haproxy 2.0.29-0ubuntu1.3 | Feb 14, 2023 |
| vim-haproxy · Ubuntu 22.04.1 LTS (jammy) | 2.4.18-0ubuntu1.2 | vim-haproxy 2.4.18-0ubuntu1.2 | Feb 14, 2023 |
| vim-haproxy · Ubuntu 24.10 (oracular) | 2.6.9-1ubuntu1 | vim-haproxy 2.6.9-1ubuntu1 | Jan 16, 2026 |
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