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[USN-8670-2] curl vulnerability

Posted on 26 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8670-2
August 25, 2026

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

curl could be made to expose sensitive information.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries

Details:

USN-8670-1 fixed a vulnerability in curl. This update provides the
corresponding update for Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu
22.04 LTS.

Original advisory details:

Joshua Rogers discovered that curl incorrectly handled reusing
connections when client certificate settings changed. This could result
in the wrong client certificates being used, contrary to expectations.

Update instructions:

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

Ubuntu 22.04 LTS
curl 7.81.0-1ubuntu1.27
libcurl3-gnutls 7.81.0-1ubuntu1.27
libcurl3-nss 7.81.0-1ubuntu1.27
libcurl4 7.81.0-1ubuntu1.27
libcurl4-gnutls-dev 7.81.0-1ubuntu1.27
libcurl4-nss-dev 7.81.0-1ubuntu1.27
libcurl4-openssl-dev 7.81.0-1ubuntu1.27

Ubuntu 20.04 LTS
curl 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl3-gnutls 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl3-nss 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl4 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl4-gnutls-dev 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl4-nss-dev 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro
libcurl4-openssl-dev 7.68.0-1ubuntu2.25+esm7
Available with Ubuntu Pro

Ubuntu 18.04 LTS
curl 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl3-gnutls 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl3-nss 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl4 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl4-gnutls-dev 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl4-nss-dev 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro
libcurl4-openssl-dev 7.58.0-2ubuntu3.24+esm12
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8670-2
https://ubuntu.com/security/notices/USN-8670-1
CVE-2026-8932

Package Information:
https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.27

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