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  5. CVE-2021-21353

CVE-2021-21353: Remote code execution via the `pretty` option.

March 3, 2021 (updated April 16, 2025)

If a remote attacker was able to control the pretty option of the pug compiler, e.g. if you spread a user provided object such as the query parameters of a request into the pug template inputs, it was possible for them to achieve remote code execution on the node.js backend.

References

  • github.com/advisories/GHSA-p493-635q-r6gr
  • github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0
  • github.com/pugjs/pug/issues/3312
  • github.com/pugjs/pug/pull/3314
  • github.com/pugjs/pug/releases/tag/pug%403.0.1
  • github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6gr
  • nvd.nist.gov/vuln/detail/CVE-2021-21353
  • www.npmjs.com/package/pug
  • www.npmjs.com/package/pug-code-gen

Code Behaviors & Features

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Affected versions

All versions before 2.0.3, all versions starting from 3.0.0 before 3.0.2

Fixed versions

  • 2.0.3
  • 3.0.2

Solution

Upgrade to versions 2.0.3, 3.0.2 or above.

Impact 9 CRITICAL

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Learn more about CVSS

Weakness

  • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Source file

npm/pug-code-gen/CVE-2021-21353.yml

Spotted a mistake? Edit the file on GitLab.

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