CVE-2026-27727
mchange-commons-java, a library that provides Java utilities, includes code that mirrors early implementations of JNDI functionality, including support for remote `factoryClassLocation` values, by which code can be downloaded and invoked within a…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.81%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
mchange-commons-java, a library that provides Java utilities, includes code that mirrors early implementations of JNDI functionality, including support for remote `factoryClassLocation` values, by which code can be downloaded and invoked within a running application. If an attacker can provoke an application to read a maliciously crafted `jaxax.naming.Reference` or serialized object, they can provoke the download and execution of malicious code. Implementations of this functionality within the JDK were disabled by default behind a System property that defaults to `false`, `com.sun.jndi.ldap.object.trustURLCodebase`. However, since mchange-commons-java includes an independent implementation of JNDI derefencing, libraries (such as c3p0) that resolve references via that implementation could be provoked to download and execute malicious code even after the JDK was hardened. Mirroring the JDK patch, mchange-commons-java's JNDI functionality is gated by configuration parameters that default to restrictive values starting in version 0.4.0. No known workarounds are available. Versions prior to 0.4.0 should be avoided on application CLASSPATHs.
- CVSS 4.0
- 8.9 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.81% probability · 55th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-74, CWE-502
- Affected
- mchange/mchange commons java
- Source
- security-advisories@github.com
References
- https://github.com/swaldman/mchange-commons-java/security/advisories/GHSA-m2cm-222f-qw44Patch, Vendor Advisory
- https://mogwailabs.de/en/blog/2025/02/c3p0-you-little-rascalExploit, Third Party Advisory
- https://www.mchange.com/projects/c3p0/#configuring_securityIssue Tracking
- https://www.mchange.com/projects/c3p0/#security-noteRelease Notes
- https://access.redhat.com/errata/RHSA-2026:14873
- https://access.redhat.com/errata/RHSA-2026:14874
- https://access.redhat.com/errata/RHSA-2026:18054
- https://access.redhat.com/errata/RHSA-2026:18055
- https://access.redhat.com/errata/RHSA-2026:18059
- https://access.redhat.com/errata/RHSA-2026:34365
- https://access.redhat.com/errata/RHSA-2026:3890
- https://access.redhat.com/errata/RHSA-2026:4285
- https://access.redhat.com/security/cve/CVE-2026-27727
- https://bugzilla.redhat.com/show_bug.cgi?id=2442671
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27727.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.