Home / mailings

PDF

[USN-8233-1] nghttp2 vulnerability

Posted on 05 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8233-1
May 05, 2026

nghttp2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- nghttp2: HTTP/2 C Library and tools

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.

Update instructions:

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

Ubuntu 25.10
libnghttp2-14 1.64.0-1.1ubuntu1.1
nghttp2 1.64.0-1.1ubuntu1.1

Ubuntu 24.04 LTS
libnghttp2-14 1.59.0-1ubuntu0.3
nghttp2 1.59.0-1ubuntu0.3

Ubuntu 22.04 LTS
libnghttp2-14 1.43.0-1ubuntu0.3
nghttp2 1.43.0-1ubuntu0.3

Ubuntu 20.04 LTS
libnghttp2-14 1.40.0-1ubuntu0.3+esm1
Available with Ubuntu Pro
nghttp2 1.40.0-1ubuntu0.3+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libnghttp2-14 1.30.0-1ubuntu1+esm3
Available with Ubuntu Pro
nghttp2 1.30.0-1ubuntu1+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libnghttp2-14 1.7.1-1ubuntu0.1~esm3
Available with Ubuntu Pro
nghttp2 1.7.1-1ubuntu0.1~esm3
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8233-1
CVE-2026-27135

Package Information:
https://launchpad.net/ubuntu/+source/nghttp2/1.64.0-1.1ubuntu1.1
https://launchpad.net/ubuntu/+source/nghttp2/1.59.0-1ubuntu0.3
https://launchpad.net/ubuntu/+source/nghttp2/1.43.0-1ubuntu0.3

--===============4392067285384696470==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

TOP