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Alerts This Week
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Ubuntu LTS USN-4820-1 nginx Moderate Security Patch CVE-2026-27136

debian lts
Calendar Grey May 13, 2026
Scroller Debian Lts
A critical security issue discovered in nghttp2 can lead to assertion failures; update recommended for Debian systems.
A vulnerabilitie was discovered in nghttp2, a server, proxy and client implementing HTTP/2
Topics%20covered

Topics Covered

security advisory debian important nghttp2 assertion cve-2026-27135

Summary

CVE-2026-27135

Fix missing iframe->state validations to avoid assertion failure. As
backported from upstream v1.68.1 (commit 5c7df8f), incl. upstream test case
from commit c619c7be0737ac78051b1cacf4b1ce5467eb838d.

For Debian 11 bullseye, this problem has been fixed in version
1.43.0-1+deb11u3.

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 LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS



Severity
important
Lowest
Low
Medium
High
Critical

Package: nghttp2
Version: 1.43.0-1+deb11u3
CVE ID: CVE-2026-27135
Debian Bug: 1131369

Topics%20covered

Topics Covered

security advisory debian important nghttp2 assertion cve-2026-27135

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