cve.bz

CVE-2026-42246

7.6 highEPSS 0.3%

High (7.6) in ruby-lang net\. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in net-imap 0.3.10, 0.4.24, 0.5.14.

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4.

Severity

CVSS 4.0

7.6 high
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

7.4 high
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 24% of CVEs (scores of 2026-11-01)
CWEs
CWE-392, CWE-393, CWE-636, CWE-754, CWE-841, CWE-325
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-vcgp-9326-pqcpRubyGemsnet-imap>=0.6.0 <0.6.40.6.4
GHSA-vcgp-9326-pqcpRubyGemsnet-imap>=0.5.0 <0.5.140.5.14
GHSA-vcgp-9326-pqcpRubyGemsnet-imap>=0.4.0 <0.4.240.4.24
GHSA-vcgp-9326-pqcpRubyGemsnet-imap<0.3.100.3.10

References

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