Is CVE-2026-70427 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-70427?

CVE-2026-70427 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-70427

Description

Jenkins 2.575 and earlier, LTS 2.568.1 and earlier does not safely handle symbolic links with effectively empty names during the extraction of `.tar` and `.tar.gz` archives, allowing attackers able to control agent processes to provide crafted archives to the controller to write files to arbitrary locations on the file system, restricted only by file system access permissions of the user running Jenkins.