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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-css-what | 5.0.1-1 | — |
| Debian 13 | node-css-what | 5.0.1-1 | — |
| Debian 12 | node-css-what | 5.0.1-1 | — |
| Debian 10 | node-css-what | 2.1.0-1+deb10u1 | DLA-3350-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-css-what | No fix yet | — |
| Ubuntu 26.04 LTS | node-css-what | No fix yet | — |
| Ubuntu 25.10 | node-css-what | No fix yet | — |
| Ubuntu 24.04 LTS | node-css-what | No fix yet | — |
| Ubuntu 18.04 LTS | node-css-what | 2.1.0-1+deb10u1build0.18.04.1 | USN-6065-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | node-css-what | 3.2.1-1ubuntu0.1~esm1 | USN-6065-1 |
| Ubuntu Pro 16.04 LTS | node-css-what | 2.1.0-1ubuntu0.16.04.1~esm1 | USN-6065-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | css-what | >= 4.0.0, < 5.0.1 | 5.0.1 | GHSA-q8pj-2vqx-8ggc |
Advisories 3
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-6065-1 node-css-what vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3350-1 node-css-what - security update Debian Security (DSA / DLA) · Mar 9, 2026