CVE-2022-39243: NuProcess is an external process execution implementation for Java

This month

HIGH 8.4UPGRADE

CVE-2022-39243 is a high-severity flaw (CVSS 8.4) affecting nuprocess. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NuProcess is an external process execution implementation for Java. In all the versions of NuProcess where it forks processes by using the JVM's Java_java_lang_UNIXProcess_forkAndExec method (1.2.0+), attackers can use NUL characters in their strings to perform command line injection. Java's ProcessBuilder isn't vulnerable because of a check in ProcessBuilder.start. NuProcess is missing that check. This vulnerability can only be exploited to inje

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-77
Published	2022-09-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nuprocess project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-09-26 14:15 UTCPublished CVE record published
2026-06-17 04:57 UTCUpdated Record last modified

nuprocess project nuprocess UPGRADE

Affected: >= 1.2.0 and < 2.0.5

Fixed in: 2.0.5

Safe to downgrade to: a release before 1.2.0

1. Check installed version

apt-cache policy nuprocess || rpm -q nuprocess || nuprocess --version

2. UPGRADE to 2.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nuprocess

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nuprocess

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison nuprocess sudo apt install nuprocess=<VERSION_BEFORE_1.2.0> sudo apt-mark hold nuprocess

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nuprocess sudo dnf downgrade nuprocess-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add nuprocess

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-39243?

nuprocess: upgrade to 2.0.5. Exact commands for each OS are on this page.

Is CVE-2022-39243 being exploited?

CVE-2022-39243 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-2022-39243 affect?

CVE-2022-39243 affects nuprocess. Severity is high (CVSS 8.4). NuProcess is an external process execution implementation for Java. In all the versions of NuProcess where it forks processes by using the JVM's Java_java_lang_UNIXProcess_forkAndExec method (1.2.0+), attackers can use NUL characters in the

How urgent is CVE-2022-39243?

Priority 53/100. High severity; Public exploit reference

Software pages

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References

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