CVE-2026-70427

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product

Jenkins

PublishedAug 5, 2026

First seenAug 5, 2026

Weakness typeCWE-59Improper link resolution

How to fix

Update

jenkins jenkins2.568.2, 2.576 or later

Vendor advisories

jenkins.io/security/advisory/2026-08-05/#SECURITY-3930

Affected products

Product	Affected versions	Fixed in
jenkins jenkins	v < 2.568.2, v < 2.576	2.568.2, 2.576

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