GHSA-56w8-48fp-6mgv
HIGHGHSA-56w8-48fp-6mgv is a high-severity (CVSS 7.5) Reachable Assertion vulnerability in golang.org/x/crypto/ssh/agent. O3 Security confirms whether GHSA-56w8-48fp-6mgv is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
golang.org/x/crypto/ssh/agent has a potential denial of service
Blast Radius
golang.org/x/crypto/ssh/agentReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
SSH clients receiving SSH_AGENT_SUCCESS when expecting a typed response will panic and cause early termination of the client process.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | golang.org/x/crypto/ssh/agent | all versions | 0.43.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/crypto/ssh/agent. 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 golang.org/x/crypto/ssh/agent to 0.43.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-56w8-48fp-6mgv 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-56w8-48fp-6mgv 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-56w8-48fp-6mgv. 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-56w8-48fp-6mgv in your dependencies?
O3 detects GHSA-56w8-48fp-6mgv across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.