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Medium, CVSS 6.5amended

Sandbox escape in notevil and argencoders-notevil

CVE-2021-23771GHSA-8g4m-cjm2-96wq

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm notevil

    Affected
    <= 1.3.3
    Fixed in
    no fixed version recorded

  • npm argencoders-notevil

    Affected
    <= 2.5.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
  • CVE-2021-23771: 1.01% estimated exploitation activity in the next 30 days; percentile 63.27 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

This affects all versions of package notevil; all versions of package argencoders-notevil. It is vulnerable to Sandbox Escape leading to Prototype pollution. The package fails to restrict access to the main context, allowing an attacker to add or modify an object's prototype. Note: This vulnerability derives from an incomplete fix in SNYK-JS-NOTEVIL-608878. This package has been deprecated.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-8g4m-cjm2-96wq

  2. Revision 1 · created ·

    Published from osv record GHSA-8g4m-cjm2-96wq

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-23771

Advisory: Sandbox escape in notevil and argencoders-notevil
IDs: CVE-2021-23771, GHSA-8g4m-cjm2-96wq
Record: https://patchnext.com/advisories/cve-2021-23771 (revision 2, source checked 26 Oct 2026, 12:16 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm notevil: affected <= 1.3.3
- npm argencoders-notevil: affected <= 2.5.0

## Suggested inspection (read-only)
- `npm ls notevil --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls argencoders-notevil --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on notevil, argencoders-notevil.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8g4m-cjm2-96wq (OSV record GHSA-8g4m-cjm2-96wq lists affected ranges: npm notevil >=0 =0 <=2.5.0)
- Verified: https://github.com/advisories/GHSA-8g4m-cjm2-96wq (GitHub-reviewed advisory GHSA-8g4m-cjm2-96wq lists affected ranges: npm notevil >=0 =0 <=2.5.0)

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