CVE-2026-47240: Net::IMAP: Command Injection via non-synchronizing literal in "raw" argument

June 9, 2026

Several Net::IMAP commands accept a “raw data” argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals.

References

github.com/advisories/GHSA-8p34-64r3-mwg8
github.com/ruby/net-imap/releases/tag/v0.6.4.1
github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8
nvd.nist.gov/vuln/detail/CVE-2026-47240

Code Behaviors & Features

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