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[USN-8229-1] sed vulnerability

Posted on 04 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8229-1
May 04, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

sed could be made to overwrite files.

Software Description:
- sed: GNU stream editor for filtering/transforming text

Details:

Michał Majchrowicz and Marcin Wyczechowski discovered that sed incorrectly
handled symbolic links when performing in-place edits. A local attacker
could possibly use this issue to overwrite arbitrary files.

Update instructions:

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

Ubuntu 26.04 LTS
sed 4.9-2ubuntu1

Ubuntu 25.10
sed 4.9-2ubuntu0.25.10.1

Ubuntu 24.04 LTS
sed 4.9-2ubuntu0.24.04.1

Ubuntu 22.04 LTS
sed 4.8-1ubuntu2.1

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

References:
https://ubuntu.com/security/notices/USN-8229-1
CVE-2026-5958

Package Information:
https://launchpad.net/ubuntu/+source/sed/4.9-2ubuntu1
https://launchpad.net/ubuntu/+source/sed/4.9-2ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/sed/4.9-2ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/sed/4.8-1ubuntu2.1

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