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Not in CISA KEV
HIGH severity

Regular expression denial of service in Delight Nashorn SandboxGHSA-38j3-6fm8-pfgc

HIGHFix: javadelight/delight-nashorn-sandbox#139

GHSA-38j3-6fm8-pfgc is a high-severity (CVSS 7.5) CWE-1333 vulnerability in org.javadelight:delight-nashorn-sandbox. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for org.javadelight:delight-nashorn-sandbox — see the affected versions and patch details below.

Also known asCVE-2021-40660
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk+0.02%
Lower risk than most CVEs64th percentile — riskier than 64% of all scored CVEsHighest risk
0.00%0.51%1.02%1.54%0.3%1.0%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.javadelight:delight-nashorn-sandbox

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in Delight Nashorn Sandbox 0.2.0. There is an ReDoS vulnerability that can be exploited to launching a denial of service (DoS) attack.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.javadelight:delight-nashorn-sandboxall versions0.3.1org.javadelight:delight-nashorn-sandbox:0.3.1

Affected Products

1 product · 1 configurations
Application
nashorn sandboxjavadelight
1 version
0.2.0
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

An issue was discovered in Delight Nashorn Sandbox 0.2.0. There is an Re…

github.comNVDJun 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.javadelight:delight-nashorn-sandbox, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.javadelight:delight-nashorn-sandbox to 0.3.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-38j3-6fm8-pfgc is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

An issue was discovered in Delight Nashorn Sandbox. There is an ReDoS vulnerability that can be exploited to launching a denial of service (DoS) attack.
O3 Security · Impact-Aware SCA

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Regular expression denial of service in Delight Nashorn…