Is openc3 affected by CVE-2026-42084?

RubyGems openc3 is affected in =7.0.0.pre.rc1 <7.0.0-rc3.

Is CVE-2026-42084 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

high

CVE-2026-42084

Q: Is CVE-2026-42084 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

RubyGems · openc3

Summary

OpenC3 COSMOS: Hijacked session token can be used to reset password for persistence

Severity: high
EPSS: 0.3% (p22)
Also known as: GHSA-wgx6-g857-jjf7
Published: 2026-04-22

References

https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7
https://nvd.nist.gov/vuln/detail/CVE-2026-42084
https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776

Related advisories

GHSA-2wvh-87g2-89hr — critical · RubyGems/openc3
CVE-2026-42087 — critical · RubyGems/openc3
CVE-2025-68271 — critical · RubyGems/openc3
CVE-2025-28389 — critical · PyPI/openc3
CVE-2025-28386 — critical · PyPI/openc3
CVE-2024-46977 — high · RubyGems/openc3
CVE-2026-42086 — medium · PyPI/openc3
CVE-2026-42085 — medium · RubyGems/openc3

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.