Vulnerability · Published May 28, 2021 · Assigned by mitre
CVE-2021-33587
High 7.5
In plain English
A high-severity security flaw in the node-css-what package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)2.0%top 18.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The css-what package 4.0.0 through 5.0.0 for Node.js does not ensure that attribute parsing has Linear Time Complexity relative to the size of the input.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-css-what | 5.0.1-1 | DEBIAN-CVE-2021-33587 |
| Debian:13 | node-css-what | 5.0.1-1 | DEBIAN-CVE-2021-33587 |
| Debian:14 | node-css-what | 5.0.1-1 | DEBIAN-CVE-2021-33587 |
| Ubuntu:24.04:LTS | node-css-what | no fix listed | UBUNTU-CVE-2021-33587 |
| Ubuntu:25.10 | node-css-what | no fix listed | UBUNTU-CVE-2021-33587 |
| Ubuntu:26.04:LTS | node-css-what | no fix listed | UBUNTU-CVE-2021-33587 |
| Ubuntu:26.10 | node-css-what | no fix listed | UBUNTU-CVE-2021-33587 |
| npm | css-what | 5.0.1 | GHSA-q8pj-2vqx-8ggc |