Is net-imap affected by CVE-2026-42246?

RubyGems net-imap is affected in >=0.6.0 =0.5.0 =0.4.0 <0.4.24, <0.3.10.

Is CVE-2026-42246 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2026-42246

Q: Is CVE-2026-42246 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

RubyGems · net-imap

Summary

net-imap vulnerable to STARTTLS stripping via invalid response timing

Severity: high
EPSS: 0.4% (p34)
Also known as: GHSA-vcgp-9326-pqcp
Published: 2026-05-04

References

https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp
https://nvd.nist.gov/vuln/detail/CVE-2026-42246
https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618

Related advisories

CVE-2026-47242 — medium · RubyGems/net-imap
CVE-2026-47240 — medium · RubyGems/net-imap
CVE-2026-42257 — medium · RubyGems/net-imap
CVE-2026-42258 — medium · RubyGems/net-imap
CVE-2026-42256 — medium · RubyGems/net-imap
CVE-2025-43857 — medium · RubyGems/net-imap
CVE-2025-25186 — medium · RubyGems/net-imap

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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.