Home / mailings [SECURITY] [DSA 6222-1] ngtcp2 security update
Posted on 21 April 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6222-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
April 21, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------
Package : ngtcp2
CVE ID : CVE-2026-40170
Zou Dikai discovered a buffer overflow in ngtcp2, a QUIC protocol library.
For the oldstable distribution (bookworm), this problem has been fixed
in version 0.12.1+dfsg-1+deb12u1.
For the stable distribution (trixie), this problem has been fixed in
version 1.11.0-1+deb13u1.
We recommend that you upgrade your ngtcp2 packages.
For the detailed security status of ngtcp2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/ngtcp2
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
