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📦 npm

GHSA-2pr6-76vf-7546

MEDIUM

GHSA-2pr6-76vf-7546 is a medium-severity (CVSS 5.9) vulnerability in js-yaml. O3 Security confirms whether GHSA-2pr6-76vf-7546 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Denial of Service in js-yaml

Published
Jun 5, 2019
Updated
Aug 4, 2021
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed

Blast Radius

1 pkg affected

Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.

js-yamlnpm
279.1Mdownloads / week

Description

Versions of js-yaml prior to 3.13.0 are vulnerable to Denial of Service. By parsing a carefully-crafted YAML file, the node process stalls and may exhaust system resources leading to a Denial of Service.

Recommendation

Upgrade to version 3.13.0.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmjs-yamlall versions3.13.0

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for js-yaml. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update js-yaml to 3.13.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-2pr6-76vf-7546 is resolved across your whole dependency graph.

  3. Workarounds

    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.

  4. How O3 protects you

    O3 pinpoints whether GHSA-2pr6-76vf-7546 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-2pr6-76vf-7546. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

Versions of `js-yaml` prior to 3.13.0 are vulnerable to Denial of Service. By parsing a carefully-crafted YAML file, the node process stalls and may exhaust system resources leading to a Denial of Service. ## Recommendation Upgrade to version 3.13.0.
O3 Security · Impact-Aware SCA

Is GHSA-2pr6-76vf-7546 in your dependencies?

O3 detects GHSA-2pr6-76vf-7546 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.