CVE-2022-25758 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in scss-tokenizer. 3 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for scss-tokenizer — see the affected versions and patch details below.
Regular expression denial of service in scss-tokenizer
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
scss-tokenizernpmDescription
All versions of the package scss-tokenizer prior to 0.4.3 are vulnerable to Regular Expression Denial of Service (ReDoS) via the loadAnnotation() function, due to the usage of insecure regex.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | scss-tokenizer | all versions | 0.4.3npm install scss-tokenizer@0.4.3 |
Affected Products
scss-tokenizerscss-tokenizer_projectResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for scss-tokenizer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update scss-tokenizer to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-25758 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Frequently Asked Questions
Is CVE-2022-25758 in your dependencies?
Find it across npm, including transitive dependencies.