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High, CVSS 8.1

Parsedown Class-Name Injection

CVE-2019-10905GHSA-62m3-fc7f-jpp8

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (erusev/parsedown 1.7.2), 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

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2019-10905: 1.47% estimated exploitation activity in the next 30 days; percentile 73.78 (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.

Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.

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

    Published from ghsa record GHSA-62m3-fc7f-jpp8

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-2019-10905

Advisory: Parsedown Class-Name Injection
IDs: CVE-2019-10905, GHSA-62m3-fc7f-jpp8
Record: https://patchnext.com/advisories/cve-2019-10905 (revision 1, source checked 26 Oct 2026, 14:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: erusev/parsedown 1.7.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist erusev/parsedown: affected < 1.7.2; fixed in 1.7.2

## Suggested inspection (read-only)
- Packagist erusev/parsedown: check the installed version with your package manager.

## 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 erusev/parsedown.
- 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://github.com/advisories/GHSA-62m3-fc7f-jpp8 (GitHub-reviewed advisory GHSA-62m3-fc7f-jpp8 lists affected ranges: Packagist erusev/parsedown >=0 <1.7.2)

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