Debian Security Advisory

DLA-3034-1 haproxy -- LTS security update

Date Reported:
30 May 2022
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 916308, Bug 916307.
In Mitre's CVE dictionary: CVE-2018-20102, CVE-2018-20103, CVE-2019-18277.
More information:

Nathan Davison discovered that HAProxy, a load balancing reverse proxy, did not correctly reject requests or responses featuring a transfer-encoding header missing the chunked value which could facilitate a HTTP request smuggling attack. Furthermore several flaws were discovered in DNS related functions that may trigger infinite recursion leading to a denial of service or to information leakage due to a out-of-bounds read.

For Debian 9 stretch, these problems have been fixed in version 1.7.5-2+deb9u1.

We recommend that you upgrade your haproxy packages.

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

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: