Home / mailings [SECURITY] [DSA 6266-1] nghttp2 security update
Posted on 14 May 2026
Debian Security Advisory- -------------------------------------------------------------------------
Debian Security Advisory DSA-6266-1 security@debian.org
https://www.debian.org/security/ Aron Xu
May 14, 2026 https://www.debian.org/security/faq
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Package : nghttp2
CVE ID : CVE-2026-27135
Debian Bug : 1131369
It was discovered that nghttp2, an implementation of the HTTP/2 protocol,
could be crashed via an assertion failure. A remote attacker could exploit
this to cause a DoS attack by sending a malformed frame immediately
after triggering the termination path.
For the oldstable distribution (bookworm), this problem has been fixed
in version 1.52.0-1+deb12u3.
For the stable distribution (trixie), this problem has been fixed in
version 1.64.0-1.1+deb13u1.
We recommend that you upgrade your nghttp2 packages.
For the detailed security status of nghttp2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/nghttp2
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
