{"id":"CVE-2026-47240","aliases":["GHSA-8p34-64r3-mwg8"],"url":"https://o3.security/vulnerability/CVE-2026-47240","summary":"Net::IMAP: Command Injection via non-synchronizing literal in \"raw\" argument","details":"Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, 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.  A server without support for non-synchronizing literals may interpret the \"+}\\r\\n\" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.","published":"2026-06-22T20:17:15.376Z","modified":"2026-09-01T12:55:50.406973131Z","cvss":null,"epss":{"score":0.00491,"percentile":0.403,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"RubyGems","name":"net-imap","fixedVersion":"0.6.4.1"},{"ecosystem":"RubyGems","name":"net-imap","fixedVersion":"0.5.15"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47240.json"},{"type":"ADVISORY","url":"https://github.com/ruby/net-imap/security/advisories/GHSA-8p34-64r3-mwg8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47240"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T12:55:50.406973131Z"}}