CVE-2021-23382

Name: CVE-2021-23382
Creator: NVD / NIST
Published: 2021-04-26T16:15:07.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.51%

Last modified Jun 17, 2026

CVE-2021-23382 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).. EPSS estimates a 2.51% chance of exploitation in the next 30 days.

Description

The package postcss before 8.2.13 are vulnerable to Regular Expression Denial of Service (ReDoS) via getAnnotationURL() and loadAnnotation() in lib/previous-map.js. The vulnerable regexes are caused mainly by the sub-pattern \/\*\s* sourceMappingURL=(.*).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.51%

82.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1333

Affected Software

Vendor	Product	Versions
Postcss	Postcss	< 7.0.36
Postcss	Postcss	>= 8.0.0, < 8.2.13

References

https://github.com/postcss/postcss/commit/2b1d04c867995e55124e0a165b7c6622c1735956Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641Exploit, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640Exploit, Patch, Third Party Advisory
https://github.com/postcss/postcss/commit/2b1d04c867995e55124e0a165b7c6622c1735956Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1255641Exploit, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640Exploit, Patch, Third Party Advisory

Timeline

Published: Apr 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23382?

How severe is CVE-2021-23382?

CVE-2021-23382 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23382?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23382?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST