Debian Security Advisory

DSA-4968-1 haproxy -- security update

Date Reported:
07 Sep 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-40346.
More information:

Ori Hollander reported that missing header name length checks in the htx_add_header() and htx_add_trailer() functions in HAProxy, a fast and reliable load balancing reverse proxy, could result in request smuggling attacks or response splitting attacks.

Additionally this update addresses #993303 introduced in DSA 4960-1 causing HAProxy to fail serving URLs with HTTP/2 containing '//'.

For the stable distribution (bullseye), this problem has been fixed in version 2.2.9-2+deb11u2.

We recommend that you upgrade your haproxy packages.

For the detailed security status of haproxy please refer to its security tracker page at: