GHSA-c96h-cxx6-rmg9 — tor-circmgr
MEDIUMGHSA-c96h-cxx6-rmg9 is a medium-severity (CVSS 5.9) CWE-670 vulnerability in tor-circmgr. A fix is available for tor-circmgr — see the affected versions and patch details below.
Tor path lengths too short when "full Vanguards" configured
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-c96h-cxx6-rmg9.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-c96h-cxx6-rmg9 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,166 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
tor-circmgr🦀artiReal-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
In Tor Arti before 1.2.3, circuits sometimes incorrectly have a length of 3 (with full vanguards), aka TROVE-2024-004.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | tor-circmgr | ≥ 0.18.0&&< 0.18.1 | 0.18.1cargo update -p tor-circmgr --precise 0.18.1 |
| 🦀crates.io | arti | ≥ 1.2.2&&< 1.2.3 | 1.2.3cargo update -p arti --precise 1.2.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for tor-circmgr, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update tor-circmgr to 0.18.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c96h-cxx6-rmg9 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 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-c96h-cxx6-rmg9 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-c96h-cxx6-rmg9. 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-c96h-cxx6-rmg9 in your dependencies?
O3 Security finds GHSA-c96h-cxx6-rmg9 across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.