GHSA-4mw5-2636-4535 — js-sandbox
GHSA-4mw5-2636-4535 is a security vulnerability in js-sandbox. No vendor fix is recorded yet; mitigation options are listed below.
op_panic in the base runtime can force a panic in the runtime's containing thread
Real-World Exposure
js-sandboxReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
Description
Affected versions use deno_core releases that expose Deno.core.ops.op_panic to the JS runtime in the base core
This function when called triggers a manual panic in the thread containing the runtime, breaking sandboxing
It can be fixed by stubbing out the exposed op:
Deno.core.ops.op_panic = (msg) => { throw new Error(msg) };
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | js-sandbox | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for js-sandbox, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of js-sandbox has shipped for GHSA-4mw5-2636-4535 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-4mw5-2636-4535 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-4mw5-2636-4535. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-4mw5-2636-4535 in your dependencies?
O3 Security finds GHSA-4mw5-2636-4535 across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.