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Unratedamended

es5-ext vulnerable to Regular Expression Denial of Service in function#copy and function#toStringTokens

CVE-2024-27088GHSA-4gmj-3p3h-gm8h

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (es5-ext 0.10.63), redeploy, then verify what is actually installed.

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 es5-ext

    Affected
    >= 0.10.0, < 0.10.63
    Fixed in
    0.10.63

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
  • CVE-2024-27088: 0.54% estimated exploitation activity in the next 30 days; percentile 45.43 (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.

Impact Passing functions with very long names or complex default argument names into function#copy orfunction#toStringTokens may put script to stall Patches Fixed with https://github.com/medikoo/es5-ext/commit/3551cdd7b2db08b1632841f819d008757d28e8e2 and https://github.com/medikoo/es5-ext/commit/a52e95736690ad1d465ebcd9791d54570e294602 Published with v0.10.63 Workarounds No real workaround aside of refraining from using above utilities. References https://github.com/medikoo/es5-ext/issues/201

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

    Amended from ghsa record GHSA-4gmj-3p3h-gm8h

  2. Revision 1 · created ·

    Published from osv record GHSA-4gmj-3p3h-gm8h

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-2024-27088

Advisory: es5-ext vulnerable to Regular Expression Denial of Service in `function#copy` and `function#toStringTokens`
IDs: CVE-2024-27088, GHSA-4gmj-3p3h-gm8h
Record: https://patchnext.com/advisories/cve-2024-27088 (revision 2, source checked 26 Oct 2026, 12:46 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: es5-ext 0.10.63. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm es5-ext: affected >= 0.10.0, < 0.10.63; fixed in 0.10.63

## Suggested inspection (read-only)
- `npm ls es5-ext --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on es5-ext.
- 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-4gmj-3p3h-gm8h (OSV record GHSA-4gmj-3p3h-gm8h lists affected ranges: npm es5-ext >=0.10.0 <0.10.63 (fixed))
- Verified: https://github.com/advisories/GHSA-4gmj-3p3h-gm8h (GitHub-reviewed advisory GHSA-4gmj-3p3h-gm8h lists affected ranges: npm es5-ext >=0.10.0 <0.10.63)

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