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Regex denial of service vulnerability in codesample pluginGHSA-h96f-fc7c-9r55

GHSA-h96f-fc7c-9r55 is a security vulnerability in tinymce. A fix is available for tinymce — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Jan 6, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

1Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
tinymcenpm
1.3Mdownloads / week

Description

Impact

A regex denial of service (ReDoS) vulnerability was discovered in a dependency of the codesample plugin. The vulnerability allowed poorly formed ruby code samples to lock up the browser while performing syntax highlighting. This impacts users of the codesample plugin using TinyMCE 5.5.1 or lower.

Patches

This vulnerability has been patched in TinyMCE 5.6.0 by upgrading to a version of the dependency without the vulnerability.

Workarounds

To work around this vulnerability, either:

  • Upgrade to TinyMCE 5.6.0 or higher
  • Disable the codesample plugin
  • Disable ruby code samples using the codesample_languages setting
  • Override the PrismJS syntax highlighter to version 1.21.0 or higher using the codesample_global_prismjs setting

Acknowledgements

Tiny Technologies would like to thank Erik Krogh Kristensen at GitHub for discovering this vulnerability.

References

https://www.tiny.cloud/docs/release-notes/release-notes56/#securityfixes

For more information

If you have any questions or comments about this advisory:

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmtinymceall versions5.6.0npm install tinymce@5.6.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update tinymce to 5.6.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h96f-fc7c-9r55 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

### Impact A regex denial of service (ReDoS) vulnerability was discovered in a dependency of the `codesample` plugin. The vulnerability allowed poorly formed ruby code samples to lock up the browser while performing syntax highlighting. This impacts users of the `codesample` plugin using TinyMCE 5.5.1 or lower. ### Patches This vulnerability has been patched in TinyMCE 5.6.0 by upgrading to a version of the dependency without the vulnerability. ### Workarounds To work around this vulnerability, either: - Upgrade to TinyMCE 5.6.0 or higher - Disable the `codesample` plugin - Disable ruby code
O3 Security · Impact-Aware SCA

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Regex denial of service vulnerability in codesample plugin