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Advisory record · GHSA-5476-xc4j-rqcv

c3p0 vulnerable to Remote Code Execution via unsafe deserialization of userOverridesAsString property

CVSS 8.9 HighEPSS 0.0060 · 48th percentile

Published by the GitHub Advisory Database at 25 Feb 2026, 18:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
com.mchange:c3p0Maven<0.12.00.12.0
Identifiers
GHSA-5476-xc4j-rqcv · CVE-2026-27830
Weakness (CWE)
CWE-94 · CWE-502
Tags
Published
25 Feb 2026
Updated
10 Sept 2026

Machine-written summary

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

Remote code execution is possible in the Maven package com.mchange:c3p0 before 0.12.0. An attacker who can reset the userOverridesAsString property on a ConnectionPoolDataSource, or supply maliciously crafted serialized objects or JNDI references, can execute unexpected code on the application's classpath. Upgrade to c3p0 0.12.0 or later; no workaround is supported for earlier versions.

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
8.9 High 4.0 CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0060, the 48th percentile, on 12 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.