GHSA-5jjv-x4fq-qjwp is a medium-severity (CVSS 5.9) CWE-203 vulnerability in shrine. O3 Security confirms whether GHSA-5jjv-x4fq-qjwp is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Possible timing attack in derivation_endpoint
Real-World Exposure
shrineReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
Impact
When using the derivation_endpoint plugin, it's possible for the attacker to use a timing attack to guess the signature of the derivation URL.
Patches
The problem has been fixed by comparing sent and calculated signature in constant time, using Rack::Utils.secure_compare. Users using the derivation_endpoint plugin are urged to upgrade to Shrine 3.3.0 or greater.
Workarounds
Users of older Shrine versions can apply the following monkey-patch after loading the derivation_endpoint plugin:
class Shrine
class UrlSigner
def verify_signature(string, signature)
if signature.nil?
fail InvalidSignature, "missing \"signature\" param"
elsif !Rack::Utils.secure_compare(signature, generate_signature(string))
fail InvalidSignature, "provided signature does not match the calculated signature"
end
end
end
end
References
You can read more about timing attacks here.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | shrine | all versions | 3.3.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for shrine. 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 shrine to 3.3.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5jjv-x4fq-qjwp 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-5jjv-x4fq-qjwp 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-5jjv-x4fq-qjwp. 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-5jjv-x4fq-qjwp in your dependencies?
O3 detects GHSA-5jjv-x4fq-qjwp across RubyGems dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.