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Debian DSA-6266-1 nghttp2 Critical DoS Exploit CVE-2026-27135

debian
Calendar Grey May 14, 2026
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nghttp2 faces a critical DoS attack due to assertion failure. Secure your Debian systems with the latest patch.
It was discovered that nghttp2, an implementation of the HTTP/2 protocol, could be crashed via an assertion failure
Topics%20covered

Topics Covered

security advisory debian exploit DoS importance nghttp2

Summary

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/



Severity
critical
Lowest
Low
Medium
High
Critical

Package: nghttp2
CVE ID: CVE-2026-27135

Topics%20covered

Topics Covered

security advisory debian exploit DoS importance nghttp2

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