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Advisory record · GHSA-w457-6q6x-cgp9

Prototype Pollution in handlebars

CVSS 9.8 CriticalCriticalEPSS 0.071 · 94th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 26 Dec 2019, 17:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
handlebarsnpm>=4.0.0, <4.3.0 || <3.0.84.3.0, 3.0.8
bootstrap-wysihtml5-railsRubyGems>=0.3.3.5, <=0.3.3.8No fixed version yet
Identifiers
GHSA-w457-6q6x-cgp9 · CVE-2019-19919
Weakness (CWE)
CWE-74 · CWE-1321
Tags
Published
26 Dec 2019
Updated
10 Sept 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.071, the 94th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 26 Dec 2019. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.