Ubuntu Security Notices USN-8229-1 USN-8229-1: sed vulnerability Publication date 4 May 2026 Overview sed could be made to overwrite files. Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages 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. 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 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 sed – 4.9-2ubuntu1 25.10 questing sed – 4.9-2ubuntu0.25.10.1 24.04 LTS noble sed – 4.9-2ubuntu0.24.04.1 22.04 LTS jammy sed – 4.8-1ubuntu2.1 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-5958 CVE-2026-5958