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CVE-2026-70427

medium CVSS 4.3 EPSS 0.4%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-70427 applies to, and the release that fixes it where the sources name one.

Jenkins 1.509 fixed in 2.568.2

At a glance

Severity
Medium
CVSS base score
4.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 35% of scored vulnerabilities
Weakness
CWE-59
Published
2026-08-05
NVD CVE.org

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