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CVE-2026-27727

Mchange Commons Java insecure deserialization

9.8 CRITICALPublic exploitEPSS 1.58%
  1. Published25 Feb 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mchange Commons Java< 0.4.0

Remediation

Fixed in
Mchange Commons Java≥ 0.4.0

References

and 5 more references

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Frequently asked

Is CVE-2026-27727 being actively exploited?

CVE-2026-27727 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.58%.

How severe is CVE-2026-27727?

CVE-2026-27727 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.58% probability of exploitation.

Which products are affected by CVE-2026-27727?

Affected products include Mchange Commons Java.

How do I fix CVE-2026-27727?

Upgrade affected software to a fixed version, for example Mchange Commons Java 0.4.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.