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Ubuntu 26.04 LTS nghttp2 Critical Crash DoS USN-8233-2 CVE-2026-27135

ubuntu
Calendar Grey May 6, 2026
Scroller Ubuntu
nghttp2 in Ubuntu 26.04 LTS can crash from malicious traffic; critical update required to prevent DoS.
nghttp2 could be made to crash if it received specially crafted network traffic.

Summary

nghttp2 could be made to crash if it received specially crafted network

traffic.

Software Description:

- nghttp2: HTTP/2 C Library and tools

Details:

USN-8233-1 fixed a vulnerability in nghttp2. This update provides the

corresponding update for Ubuntu 26.04 LTS.

Original advisory details:

Andrew MacPherson discovered that nghttp2 did not properly validate

internal state when the session termination API was called. A remote

attacker could possibly use this issue to cause nghttp2 to crash,

resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu crash nghttp2

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  libnghttp2-14                   1.68.0-2ubuntu0.1
  nghttp2                         1.68.0-2ubuntu0.1

In general, a standard system update will make all the necessary
changes.

References

https://ubuntu.com/security/notices/USN-8233-2

https://ubuntu.com/security/notices/USN-8233-1

CVE-2026-27135

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8233-2

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu crash nghttp2

Package Information

https://launchpad.net/ubuntu/+source/nghttp2/1.68.0-2ubuntu0.1

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