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.
Affected products
pugjs: pug; pugjs: pug-code-gen
References10
- github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a46… PatchThird Party Advisory
- github.com/pugjs/pug/issues/3312 ExploitPatchThird Party Advisory
- github.com/pugjs/pug/pull/3314 PatchThird Party Advisory
- github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a46… PatchThird Party Advisory
- github.com/pugjs/pug/issues/3312 ExploitPatchThird Party Advisory
- github.com/pugjs/pug/pull/3314 PatchThird Party Advisory
- github.com/pugjs/pug/releases/tag/pug%403.0.1 Release NotesThird Party Advisory
- github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6gr Third Party Advisory
- www.npmjs.com/package/pug ProductThird Party Advisory
- www.npmjs.com/package/pug-code-gen ProductThird Party Advisory
Metrics
- CVSS 3.1
-
9.0
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 4% percentile: 91 · as of 11 November 2026
- CWE
- CWE-74CWE-94
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.