USN-8670-3: curl vulnerability
Publication date
8 September 2026
Overview
curl could be made to expose sensitive information.
Releases
Packages
- 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 26.04 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.
USN-8670-1 fixed a vulnerability in curl. This update provides the
corresponding update for Ubuntu 26.04 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
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | curl – 8.18.0-1ubuntu2.5 | ||
| libcurl3t64-gnutls – 8.18.0-1ubuntu2.5 | |||
| libcurl4-gnutls-dev – 8.18.0-1ubuntu2.5 | |||
| libcurl4-openssl-dev – 8.18.0-1ubuntu2.5 | |||
| libcurl4t64 – 8.18.0-1ubuntu2.5 | |||
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