GHSA-qg5g-gv98-5ffh
GHSA-qg5g-gv98-5ffh is a CWE-248 vulnerability in rustls. O3 Security confirms whether GHSA-qg5g-gv98-5ffh is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
rustls network-reachable panic in `Acceptor::accept`
Real-World Exposure
rustlsReal-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
A bug introduced in rustls 0.23.13 leads to a panic if the received TLS ClientHello is fragmented. Only servers that use rustls::server::Acceptor::accept() are affected.
Servers that use tokio-rustls's LazyConfigAcceptor API are affected.
Servers that use tokio-rustls's TlsAcceptor API are not affected.
Servers that use rustls-ffi's rustls_acceptor_accept API are affected.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | rustls | ≥ 0.23.13&&< 0.23.18 | 0.23.18 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for rustls. 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 rustls to 0.23.18 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-qg5g-gv98-5ffh 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-qg5g-gv98-5ffh 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-qg5g-gv98-5ffh. 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-qg5g-gv98-5ffh in your dependencies?
O3 detects GHSA-qg5g-gv98-5ffh 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.