CVE-2023-26919: delight-nashorn-sandbox 0.2.4 and 0.2.5 is vulnerable to sandbox escape

This week

HIGH 7.2REMOTEDOWNGRADE

CVE-2023-26919 is a high-severity flaw (CVSS 7.2) affecting nashorn sandbox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

delight-nashorn-sandbox 0.2.4 and 0.2.5 is vulnerable to sandbox escape. When allowExitFunctions is set to false, the loadWithNewGlobal function can be used to invoke the exit and quit methods to exit the Java process.

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-74
Published	2023-04-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: javadelight

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

Am I affected?

Timeline

2023-04-10 16:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

javadelight nashorn sandbox DOWNGRADE

Affected: 0.2.4 · 0.2.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.2.4

1. Check installed version

apt-cache policy nashorn-sandbox || rpm -q nashorn-sandbox || nashorn-sandbox --version

2. No fixed release: DOWNGRADE to a release before 0.2.4 (Debian / Ubuntu)

apt-cache madison nashorn-sandbox sudo apt install nashorn-sandbox=<VERSION_BEFORE_0.2.4> sudo apt-mark hold nashorn-sandbox

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nashorn-sandbox sudo dnf downgrade nashorn-sandbox-<VERSION_BEFORE_0.2.4> sudo dnf versionlock add nashorn-sandbox

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-2023-26919?

nashorn sandbox: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26919 being exploited?

CVE-2023-26919 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-2023-26919 affect?

CVE-2023-26919 affects nashorn sandbox. Severity is high (CVSS 7.2). delight-nashorn-sandbox 0.2.4 and 0.2.5 is vulnerable to sandbox escape. When allowExitFunctions is set to false, the loadWithNewGlobal function can be used to invoke the exit and quit methods to exit the Java process.

How urgent is CVE-2023-26919?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

Related CVEs

CVE-2021-40660 HIGH 7.5 DOWNGRADE An issue was discovered in Delight Nashorn Sandbox 0.2.0

References

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