Jenkins <2.575 / <2.568.1: TAR Symlink Extraction Allows Arbitrary Write
CVE-2026-70427 Published on August 5, 2026
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.
Vulnerability Analysis
CVE-2026-70427 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-70427 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-70427
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Affected Versions
Jenkins Project Jenkins:- Version 2.576 and below * is unaffected.
- Version 2.568.2 and below 2.568.* is unaffected.