What’s Vulnerable › Vulnerabilities
CVE-2021-23368: Regular Expression Denial of Service (ReDoS)
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 3.5% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-04-12 · updated 2026-06-17
Description
The package postcss from 7.0.0 and before 8.2.10 are vulnerable to Regular Expression Denial of Service (ReDoS) during source map parsing.
Affected products
- postcss: from 7.0.0 before 7.0.36; from 8.0.0 before 8.2.10 — fixed in 7.0.36, 8.2.10
- Npm Postcss: from 7.0.0 before 7.0.36; from 8.0.0 before 8.2.10 — fixed in 7.0.36, 8.2.10
How to fix
Upgrade to a fixed version: postcss 7.0.36, 8.2.10; Npm Postcss 7.0.36, 8.2.10. Check the vendor advisory for mitigations.
References
- https://github.com/postcss/postcss/commit/8682b1e4e328432ba692bed52326e84439cec9e4
- https://github.com/postcss/postcss/commit/b6f3e4d5a8d7504d553267f80384373af3a3dec5
- https://lists.apache.org/thread.html/r00158f5d770d75d0655c5eef1bdbc6150531606c8f8bcb778f0627be%40%3Cdev.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/r16e295b4f02d81b79981237d602cb0b9e59709bafaa73ac98be7cef1%40%3Cdev.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/r49afb49b38748897211b1f89c3a64dc27f9049474322b05715695aab%40%3Cdev.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/r5acd89f3827ad9a9cad6d24ed93e377f7114867cd98cfba616c6e013%40%3Ccommits.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/r8def971a66cf3e375178fbee752e1b04a812a047cc478ad292007e33%40%3Cdev.myfaces.apache.org%3E
- https://lists.apache.org/thread.html/rad5af2044afb51668b1008b389ac815a28ecea9eb75ae2cab5a00ebb%40%3Ccommits.myfaces.apache.org%3E
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1244795
- https://snyk.io/vuln/SNYK-JS-POSTCSS-1090595
- https://github.com/postcss/postcss/commit/8682b1e4e328432ba692bed52326e84439cec9e4
- https://github.com/postcss/postcss/commit/b6f3e4d5a8d7504d553267f80384373af3a3dec5
Get alerted when CVE-2021-23368 or the next vulnerability affects your stack