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Advisory record · GHSA-g2xq-2v27-4rh3

Jenkins arbitrary type deserialization from attacker-controlled config.xml allows remote code execution and user impersonation

CVSS 8.8 HighCriticalEPSS 0.51 · 98th percentile

Critical, because:

  • CVSS score 8.8 (7.0 or more) and EPSS 0.51 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 10 Jun 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.jenkins-ci.main:jenkins-coreMaven<2.555.3 || >=2.556, <2.5682.555.3, 2.568
Identifiers
GHSA-g2xq-2v27-4rh3 · BIT-jenkins-2026-53435 · CVE-2026-53435
Weakness (CWE)
CWE-502
Tags
Published
10 Jun 2026
Updated
10 Sept 2026

Machine-written summary

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

Jenkins core (org.jenkins-ci.main:jenkins-core) versions before 2.555.3, and from 2.556 up to 2.568, are vulnerable. An attacker who can submit a crafted config.xml can cause Jenkins to deserialize arbitrary types from core or plugins, which can lead to impersonating any user, running code through the Script Console, or reading arbitrary files on the controller. Upgrade to 2.555.3 or 2.568.

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 0.51, the 98th percentile, on 9 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.