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CVE-2026-27727: CVE-2026-27727: Remote Code Execution in mchange-commons-java Custom JNDI Implementation

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CVE-2026-27727: Remote Code Execution in mchange-commons-java Custom JNDI Implementation

Vulnerability ID: CVE-2026-27727
CVSS Score: 9.8
Published: 2026-02-25

CVE-2026-27727 is a critical remote code execution vulnerability in the mchange-commons-java utility library, a common dependency for the c3p0 JDBC connection pool. The flaw stems from a custom JNDI reference resolution mechanism that bypasses modern JDK security controls, allowing unauthenticated attackers to load and execute arbitrary remote Java classes via crafted serialized objects.

TL;DR

A critical RCE vulnerability in mchange-commons-java (< 0.4.0) allows unauthenticated attackers to execute arbitrary code by supplying a crafted JNDI reference. The library's custom implementation bypasses modern JDK trust boundaries, enabling remote class loading.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-74
  • Attack Vector: Network
  • CVSS v3.1: 9.8
  • EPSS Score: 0.00098
  • Impact: Remote Code Execution
  • Exploit Status: PoC / Publicly Documented
  • CISA KEV: No

Affected Systems

  • mchange-commons-java < 0.4.0
  • c3p0 (all versions utilizing vulnerable mchange-commons-java builds)
  • Java applications utilizing c3p0 for JDBC connection pooling
  • mchange-commons-java: < 0.4.0 (Fixed in: 0.4.0)
  • c3p0: All versions using mchange-commons-java < 0.4.0 (Fixed in: Update dependency to 0.4.0)

Code Analysis

Commit: f9057ca

Fix for CVE-2026-27727: Introduce configuration gates for remote class loading

Mitigation Strategies

  • Upgrade mchange-commons-java to version 0.4.0 or higher.
  • Implement strict network egress filtering to block unexpected outbound requests from Java application servers.
  • Audit application dependency trees to identify hidden transitive inclusions of mchange-commons-java via c3p0.

Remediation Steps:

  1. Identify all projects utilizing c3p0 or mchange-commons-java via dependency management tools (e.g., mvn dependency:tree).
  2. Update the dependency declarations in pom.xml or build.gradle to enforce mchange-commons-java version 0.4.0.
  3. Rebuild and redeploy the affected applications.
  4. Monitor outbound network traffic for unapproved connections to external IPs on ports 80, 443, and 1389.

References

Read the full report for CVE-2026-27727 on our website for more details including interactive diagrams and full exploit analysis.

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