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CVE-2026-42258

5.8 mediumEPSS 0.8%

Medium (5.8) in ruby-lang net\. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in net-imap 0.4.24, 0.5.14, 0.6.4.

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Severity

CVSS 4.0

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

CVSS 3.1

5.3 medium
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L
EPSS
0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)
CWEs
CWE-77, CWE-93
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-75xq-5h9v-w6pxRubyGemsnet-imap>=0.6.0 <0.6.40.6.4
GHSA-75xq-5h9v-w6pxRubyGemsnet-imap>=0.5.0 <0.5.140.5.14
GHSA-75xq-5h9v-w6pxRubyGemsnet-imap<0.4.240.4.24

References

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