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Advisory record · GHSA-r6qv-frpc-q66c

Jenkins has a link following vulnerability allows arbitrary file creation

CVSS 8.8 HighEPSS 0.021 · 81st percentile

Published by the GitHub Advisory Database at 18 Mar 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jenkins-ci.main:jenkins-coreMaven<2.5552.555
Identifiers
GHSA-r6qv-frpc-q66c · BIT-jenkins-2026-33001 · CVE-2026-33001
Weakness (CWE)
CWE-22 · CWE-59 · CWE-61
Tags
Published
18 Mar 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Jenkins core (Maven org.jenkins-ci.main:jenkins-core) versions before 2.555 are vulnerable, including 2.554 and earlier and LTS 2.541.2 and earlier. Its handling of symbolic links while extracting .tar and .tar.gz archives is unsafe, so a crafted archive can write files to arbitrary locations. An attacker with Item/Configure permission, or control of agent processes, can use this to deploy malicious scripts or plugins on the controller. Upgrade jenkins-core to version 2.555.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.021, the 81st percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.