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USN-5063-1: HAProxy vulnerabilities

8 September 2021

HAProxy could be made to expose sensitive information over the network.



  • haproxy - fast and reliable load balancing reverse proxy


Ori Hollander discovered that HAProxy incorrectly handled HTTP header name
length encoding. A remote attacker could possibly use this issue to inject
a duplicate content-length header and perform request smuggling attacks.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.04
Ubuntu 20.04

In general, a standard system update will make all the necessary changes.