CVE-2026-70427 Path traversal in Jenkins
Attackers controlling agent processes can exploit symbolic link handling in archive extraction to write files to arbitrary locations on the Jenkins controller.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-70427?
CVE-2026-70427 is a medium-severity path traversal vulnerability in Jenkins Jenkins, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-59
Which versions are affected by CVE-2026-70427?
1 open source package ship an affected version, including jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
jenkins Bitnami | All versions | 2.568.2, 2.576.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-70427?
Upgrade jenkins to a fixed version for your release line: 2.568.2 or 2.576.0.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-70427 being exploited?
There is no known exploitation of CVE-2026-70427 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Jenkins
- CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal
- CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data
- CVE-2017-1000353 Jenkins Remote Code Execution
- CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure
- CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Sources
Also known as BIT-jenkins-2026-70427, GHSA-xvrr-fjq7-cfrw, MINI-2v9v-4qcr-f833, MINI-5qgh-9rwg-cpqx, MINI-6x39-vh65-28cx, MINI-9r3f-x3wr-w3q4 and 4 more.