CVE-2026-27727: mchange-commons-java, a library that provides Java utilities, includes code that mirrors early implementations

Q: How do I fix CVE-2026-27727?

mchange commons java: upgrade to 0.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-27727 being exploited?

CVE-2026-27727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-27727 affect?

CVE-2026-27727 affects mchange commons java. Severity is critical (CVSS 9.8). 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 wi

Q: How urgent is CVE-2026-27727?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-27727 is a critical-severity flaw (CVSS 9.8) affecting mchange commons java. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-74, CWE-502
Published	2026-02-25
Last modified	2026-08-17

Publisher (CNA): GitHub, Inc. · Vendor: mchange

Last updated 2026-08-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 17:25 UTCPublished CVE record published
2026-08-17 12:17 UTCUpdated Record last modified

mchange mchange commons java UPGRADE

Affected: < 0.4.0

Fixed in: 0.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy mchange-commons-java || rpm -q mchange-commons-java || mchange-commons-java --version

2. UPGRADE to 0.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mchange-commons-java

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mchange-commons-java

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Maven · com.mchange:mchange-commons-java · FIXED · 0.4.0 · vulnerable: < 0.4.0 · source

Set com.mchange:mchange-commons-java to 0.4.0 or later in pom.xml or build.gradle, then rebuild and redeploy.

Fedora 46 · python-configargparse · FIXED · 1.9.0-1.fc46 · FEDORA-2026-3ab7c44443 · source

sudo dnf upgrade --advisory=FEDORA-2026-3ab7c44443

Ubuntu 20.04 · c3p0 · FIXED · 0.9.1.2-10ubuntu0.20.04.1+esm1

sudo apt update && sudo apt install --only-upgrade c3p0 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' c3p0)" ge "0.9.1.2-10ubuntu0.20.04.1+esm1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · c3p0 · FIXED · 0.9.1.2-10ubuntu1+esm1

sudo apt update && sudo apt install --only-upgrade c3p0 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' c3p0)" ge "0.9.1.2-10ubuntu1+esm1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · c3p0 · FIXED · 0.9.1.2-10ubuntu2+esm1

sudo apt update && sudo apt install --only-upgrade c3p0 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' c3p0)" ge "0.9.1.2-10ubuntu2+esm1" && echo PATCHED || echo STILL-VULNERABLE

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27727?

mchange commons java: upgrade to 0.4.0. Exact commands for each OS are on this page.

Is CVE-2026-27727 being exploited?

CVE-2026-27727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27727 affect?

CVE-2026-27727 affects mchange commons java. Severity is critical (CVSS 9.8). 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 wi

How urgent is CVE-2026-27727?

Priority 60/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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