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HIGH severity

Regular Expression Denial of Service in simple-markdownGHSA-gpvj-gp8c-c7p2

HIGHFix: ariabuckles/simple-markdown@89797fe

GHSA-gpvj-gp8c-c7p2 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in simple-markdown. A fix is available for simple-markdown — see the affected versions and patch details below.

Also known asCVE-2019-25103
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.48%0.96%1.44%0.5%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

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.

143other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
simple-markdownnpm
435Kdownloads / week

Description

A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file simple-markdown.js. The manipulation leads to inefficient regular expression complexity. The attack can be launched remotely. Upgrading to version 0.5.2 is able to address this issue. The name of the patch is 89797fef9abb4cab2fb76a335968266a92588816. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-220639.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmsimple-markdownall versions0.5.2npm install simple-markdown@0.5.2

Affected Products

1 product · 1 configurations
Application
simple-markdownkhanacademy
1 version
0.5.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update simple-markdown to 0.5.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gpvj-gp8c-c7p2 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.

Frequently Asked Questions

A vulnerability has been found in simple-markdown 0.5.1 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file simple-markdown.js. The manipulation leads to inefficient regular expression complexity. The attack can be launched remotely. Upgrading to version 0.5.2 is able to address this issue. The name of the patch is 89797fef9abb4cab2fb76a335968266a92588816. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-220639.
O3 Security · Impact-Aware SCA

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Regular Expression Denial of Service in simple-markdown