GHSA-3cvr-822r-rqcc
MEDIUMGHSA-3cvr-822r-rqcc is a medium-severity (CVSS 5.3) CWE-93 vulnerability in undici. 2 public exploit references exist, so weaponization risk is real. O3 Security confirms whether GHSA-3cvr-822r-rqcc is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
undici before v5.8.0 vulnerable to CRLF injection in request headers
Blast Radius
Weekly download volume for affected packages — a proxy for how broadly this vulnerability is deployed.
undicinpmDescription
Impact
It is possible to inject CRLF sequences into request headers in Undici.
const undici = require('undici')
const response = undici.request("http://127.0.0.1:1000", {
headers: {'a': "\r\nb"}
})
The same applies to path and method
Patches
Update to v5.8.0
Workarounds
Sanitize all HTTP headers from untrusted sources to eliminate \r\n.
References
https://hackerone.com/reports/409943 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12116
For more information
If you have any questions or comments about this advisory:
- Open an issue in undici repository
- To make a report, follow the SECURITY document
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | undici | all versions | 5.8.0 |
Research 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 undici. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update undici to 5.8.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3cvr-822r-rqcc is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-3cvr-822r-rqcc is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-3cvr-822r-rqcc. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-3cvr-822r-rqcc in your dependencies?
O3 detects GHSA-3cvr-822r-rqcc across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.