Fedora 44 ngtcp2 Critical Denial of Service Fix CVE-2026-40170
fedora
April 28, 2026
Update to 1.22.1 (rhbz#2452790) Fixes CVE-2026-40170
Summary
"Call it TCP/2. One More Time."
ngtcp2 project is an effort to implement RFC9000 QUIC protocol.
Update Information:
Update to 1.22.1 (rhbz#2452790) Fixes CVE-2026-40170
Topics Covered
Change Log
* Mon Apr 20 2026 Petr Men\u0161k
References
[ 1 ] Bug #2452790 - ngtcp2-1.22.1 is available
https://bugzilla.redhat.com/show_bug.cgi?id=2452790
[ 2 ] Bug #2459283 - CVE-2026-40170 ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2459283
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-705eb9cf95' 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
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Severity
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Name: ngtcp2
Product: Fedora 44
Version: 1.22.1
Release: 1.fc44
Summary: Implementation of RFC 9000 QUIC protocol
Topics Covered
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