Pug allows JavaScript code execution if an application accepts untrusted input

published 2024-05-24 2 y ago modified 2026-09-10 1 mo ago also GHSA-3965-hpx2-q597 , EUVD-2024-1383

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits: 0; none known

Pug through 3.0.2 allows JavaScript code execution if an application accepts untrusted input for the name option of the compileClient, compileFileClient, or compileClientWithDependenciesTracked function. NOTE: these functions are for compiling Pug templates into JavaScript, and there would typically be no reason to allow untrusted callers.

Patch / fix

fixed in 2 links 4

npm pug-code-gen 3.0.3
npm pug 3.0.3

github.com/pugjs/pug@32acfe8 commit
github.com/pugjs/pug#3428 pull request
github.com/pugjs/pug#3438 pull request
github.com/pugjs/pug/releases/tag/pug%403.0.3 release

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-06-06)

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CNA	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
GitHub	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	pug-code-gen	<3.0.3	3.0.3
npm	pug	<3.0.3	3.0.3

Affected products

pugjs pug

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary