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[USN-8229-2] sed vulnerability

Posted on 28 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8229-2
May 28, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

sed could be made to overwrite files.

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

Details:

USN-8229-1 fixed a vulnerability in sed. This update provides the
corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory 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 20.04 LTS
sed 4.7-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
sed 4.4-2ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8229-2
https://ubuntu.com/security/notices/USN-8229-1
CVE-2026-5958

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