CVE-2021-21353

Pug is an npm package which is a high-performance template engine. In pug before version 3.0.1, 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. This is fixed in version 3.0.1. This advisory applies to multiple pug packages including "pug", "pug-code-gen". pug-code-gen has a backported fix at version 2.0.3. This advisory is not exploitable if there is no way for un-trusted input to be passed to pug as the `pretty` option, e.g. if you compile templates in advance before applying user input to them, you do not need to upgrade.

• CWE-74
• CWE-94

• https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0Patch, Third Party Advisory
• https://github.com/pugjs/pug/issues/3312Exploit, Patch, Third Party Advisory
• https://github.com/pugjs/pug/pull/3314Patch, Third Party Advisory
• https://github.com/pugjs/pug/releases/tag/pug%403.0.1Release Notes, Third Party Advisory
• https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6grThird Party Advisory
• https://www.npmjs.com/package/pugProduct, Third Party Advisory
• https://www.npmjs.com/package/pug-code-genProduct, Third Party Advisory
• https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0Patch, Third Party Advisory
• https://github.com/pugjs/pug/issues/3312Exploit, Patch, Third Party Advisory
• https://github.com/pugjs/pug/pull/3314Patch, Third Party Advisory
• https://github.com/pugjs/pug/releases/tag/pug%403.0.1Release Notes, Third Party Advisory
• https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6grThird Party Advisory
• https://www.npmjs.com/package/pugProduct, Third Party Advisory
• https://www.npmjs.com/package/pug-code-genProduct, Third Party Advisory

Published

Mar 3, 2021

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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