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Medium severity6.8NVD Advisory· Published Mar 3, 2021· Updated Jun 17, 2026

CVE-2021-21353

CVE-2021-21353

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pugnpm
< 3.0.13.0.1
pug-code-gennpm
< 2.0.32.0.3
pug-code-gennpm
>= 3.0.0, < 3.0.23.0.2

Affected products

123

Patches

Vulnerability mechanics

References

9

News mentions

0

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