Description
HAproxy 1.6.x before 1.6.6, when a deny comes from a reqdeny rule, allows remote attackers to cause a denial of service (uninitialized memory access and crash) or possibly have unspecified other impact via unknown vectors.
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 | 1.6.5-2 | — |
| Debian 13 | haproxy | 1.6.5-2 | — |
| Debian 12 | haproxy | 1.6.5-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | haproxy | 1.6.3-1ubuntu0.1 | USN-3011-1 |
Advisories 1
- USN-3011-1 haproxy vulnerability Ubuntu Security Notices (USN) · Feb 10, 2026
References
- [oss-security] 20160609 Re: CVE Request: haproxy remote denial of service via reqdeny mailing-list
- http://git.haproxy.org/?p=haproxy-1.6.git%3Ba=commit%3Bh=60f01f8c89e4fb2723d5a9f2046286e699567e0b
- USN-3011-1 vendor-advisory
- [oss-security] 20160609 CVE Request: haproxy remote denial of service via reqdeny mailing-list