GHSA-q89x-f52w-6hj2
MEDIUMGHSA-q89x-f52w-6hj2 is a medium-severity (CVSS 5.3) CWE-93 vulnerability in hyper. O3 Security confirms whether GHSA-q89x-f52w-6hj2 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Headers containing newline characters can split messages in hyper
Real-World Exposure
hyper🦀hyperReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
Description
Serializing of headers to the socket did not filter the values for newline bytes (\r or \n), which allowed for header values to split a request or response. People would not likely include newlines in the headers in their own applications, so the way for most people to exploit this is if an application constructs headers based on unsanitized user input.
This issue was fixed by replacing all newline characters with a space during serialization of a header value.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | hyper | ≥ 0.10.0&&< 0.10.2 | 0.10.2 |
| 🦀crates.io | hyper | all versions | 0.9.18 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hyper. 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 hyper to 0.10.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q89x-f52w-6hj2 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-q89x-f52w-6hj2 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-q89x-f52w-6hj2. 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-q89x-f52w-6hj2 in your dependencies?
O3 detects GHSA-q89x-f52w-6hj2 across crates.io dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.