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Fedora 44 erlang-cowboy Critical DoS Session Fixation CVE-2026-43972

fedora
Calendar Grey June 20, 2026
Dist Fedora Esm H88
Critical updates for erlang-cowboy and erlang-gun resolve security flaws and improve functionality in Fedora 44.
Gun ver

Summary

Small, fast, modular HTTP server written in Erlang.

Update Information:

Gun ver. 2.4.1 and its dependencies New erlang-gun

Topics%20covered

Topics Covered

security advisory denial of service fedora important session fixation cross-origin

Change Log

* Fri Jun 12 2026 Peter Lemenkov - 2.16.1-1 - Cowboy ver. 2.16.1 * Wed Jun 10 2026 Peter Lemenkov - 2.16.0-1 - Cowboy ver. 2.16.0

References


[ 1 ] Bug #2486315 - erlang-cowlib-2.17.0 is available https://bugzilla.redhat.com/show_bug.cgi?id=2486315 [ 2 ] Bug #2486350 - erlang-gun-2.4.0 is available https://bugzilla.redhat.com/show_bug.cgi?id=2486350 [ 3 ] Bug #2486422 - CVE-2026-43972 erlang-gun: Gun: Cross-origin cookie injection leading to session fixation and account takeover. [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2486422 [ 4 ] Bug #2486423 - CVE-2026-43974 erlang-gun: gun: Denial of Service via unsolicited 101 Switching Protocols response [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2486423 [ 5 ] Bug #2486424 - CVE-2026-43973 erlang-gun: gun: Denial of Service via unbounded HTTP/1.1 response buffering [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2486424 [ 6 ] Bug #2487823 - erlang-cowboy-2.16.1 is available https://bugzilla.redhat.com/show_bug.cgi?id=2487823 [ 7 ] Bug #2487824 - erlang-cowlib-2.17.1 is ...

Read the Full Advisory

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-c17ea7a74d' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
important
Lowest
Low
Medium
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Critical

Name: erlang-cowboy
Product: Fedora 44
Version: 2.16.1
Release: 1.fc44
URL: https://github.com/ninenines/cowboy
Summary: Small, fast, modular HTTP server written in Erlang

Topics%20covered

Topics Covered

security advisory denial of service fedora important session fixation cross-origin

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