CVE-2026-48921 Jenkins Pipeline: Groovy Libraries Plugin does not prohibit symbolic links in shared libraries

What is CVE-2026-48921?

CVE-2026-48921 is a high-severity path traversal vulnerability in Jenkins Pipeline: Groovy Libraries Plugin, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Jenkins Pipeline: Groovy Libraries Plugin 797.v90ea_a_9b_e45a_0 and earlier does not prohibit symbolic links in shared libraries, allowing attackers able to control the content of a library used by a Pipeline job to read arbitrary files on the Jenkins controller filesystem.

Weakness: CWE-59

Which versions are affected by CVE-2026-48921?

2 open source packages ship an affected version, including io.jenkins.plugins:pipeline-groovy-lib. It affects 1 product.

Products include Jenkins Pipeline\.

How do I fix CVE-2026-48921?

Upgrade io.jenkins.plugins:pipeline-groovy-lib to 798.v5cc688825312 or later.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-48921 being exploited?

There is no known exploitation of CVE-2026-48921 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Pipeline: Groovy Libraries Plugin

• CVE-2019-1003030 Jenkins Matrix Project Plugin Remote Code Execution Exploited Critical 9.9
• CVE-2022-43402 Jenkins Pipeline: Groovy Plugin allows sandbox protection bypass and arbitrary code execution Critical 9.9
• CVE-2019-1003041 Sandbox bypass vulnerability in Jenkins Pipeline: Groovy Plugin Critical 9.8
• CVE-2022-43407 CSRF protection for any URL can be bypassed in Jenkins Pipeline: Input Step Plugin High 8.8
• CVE-2022-25173 Improper Neutralization of Special Elements used in an OS Command in Jenkins Pipeline: Groovy Plugin High 8.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qjq3-wqj5-g37q.