CVE-2026-33001 Jenkins has a link following vulnerability allows arbitrary file creation
Attackers with configure permissions can exploit symlink handling in archive extraction to write arbitrary files, enabling malicious script deployment.
- 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-2026-33001?
CVE-2026-33001 is a high-severity path traversal vulnerability in Jenkins Jenkins, published on 18 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Jenkins 2.554 and earlier, LTS 2.541.2 and earlier does not safely handle symbolic links during the extraction of .tar and .tar.gz archives, allowing crafted archives to write files to arbitrary locations on the filesystem, restricted only by file system access permissions of the user running Jenkins. This can be exploited to deploy malicious scripts or plugins on the controller by attackers with Item/Configure permission, or able to control agent processes.
Which versions are affected by CVE-2026-33001?
3 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.main:jenkins-core Maven | All versions | 2.555 |
org.jenkins-ci.main:jenkins-core Maven | All versions | 2.555 |
jenkins Bitnami | All versions | 2.541.3, 2.555.0 |
Products include Jenkins Jenkins.
How do I fix CVE-2026-33001?
Upgrade org.jenkins-ci.main:jenkins-core to 2.555 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-33001 being exploited?
There is no known exploitation of CVE-2026-33001 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-2026-33001, GHSA-r6qv-frpc-q66c, MINI-2cc2-qwm4-28mj, MINI-9fxm-jf7m-f835, MINI-ggfv-34mc-4hfw, MINI-gxww-9vmx-w34q and 2 more.