PT-2021-3172 · Unknown+1 · Pug-Code-Gen+1

Forbes Lindesay · Published 2021-02-10 · Updated 2025-05-27 · CVE-2021-21353

Positive Technologies (AI Summary)

CVSS v2.0

9.3

Critical

Base vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions pug versions prior to 3.0.1 pug-code-gen versions prior to 2.0.3

Description The issue is related to the insufficient neutralization of special elements in the output of the Pug HTML preprocessor, specifically in the VisitMixin and visitMixinBlock functions. This can allow a remote attacker to execute arbitrary code if they can control the pretty option of the pug compiler, for example, by spreading a user-provided object into the pug template inputs.

Recommendations For pug versions prior to 3.0.1, upgrade to version 3.0.1 or later. For pug-code-gen versions prior to 2.0.3, upgrade to version 2.0.3 or later. As a temporary workaround, consider compiling templates in advance before applying user input to them, to prevent un-trusted input from being passed to pug as the pretty option.

Exploit

Fix

RCE

Special Elements Injection

Code Injection

Weakness Enumeration

CWE-74

CWE-94

Related Identifiers

BDU:2021-02843

CVE-2021-21353

GHSA-P493-635Q-R6GR

Affected Products

Pug

Pug-Code-Gen

References · 15

• 🔥 https://github.com/pugjs/pug/issues/3312 · Exploit
• https://github.com/pugjs/pug/pull/3314 · Patch
• https://github.com/pugjs/pug/commit/991e78f7c4220b2f8da042877c6f0ef5a4683be0 · Patch
• https://bdu.fstec.ru/vul/2021-02843 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-21353 · Security Note
• https://osv.dev/vulnerability/GHSA-p493-635q-r6gr · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21353 · Vendor Advisory
• https://github.com/pugjs/pug/releases/tag/pug%403.0.1 · Note
• https://github.com/pugjs/pug/security/advisories/GHSA-p493-635q-r6gr · Note
• https://t.me/cvenotify/10777 · Telegram Post
• https://npmjs.com/package/pug · Note
• https://ibm.com/blogs/psirt/security-bulletin-a-security-vulnerability-in-node-js-pug-and-pug-code-gen-module-affects-ibm-cloud-pak-for-multicloud-management-managed-service · Note
• https://t.me/cvenotify/123753 · Telegram Post
• https://t.me/cvenotify/10804 · Telegram Post
• https://npmjs.com/package/pug-code-gen · Note