{"id":"CVE-2026-42257","state":"PUBLISHED","title":"net-imap: Command Injection via \"raw\" arguments to multiple commands","description":"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, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.","publishedAt":"2026-05-09T19:39:48.398Z","updatedAt":"2026-05-13T19:33:13.948Z","severity":{"score":5.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["ruby net-imap"],"affected":[{"vendor":"ruby","product":"net-imap","versions":[{"version":"< 0.4.24","status":"affected"},{"version":">= 0.5.0, < 0.5.14","status":"affected"},{"version":">= 0.6.0, < 0.6.4","status":"affected"}]}],"references":["https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg","https://github.com/ruby/net-imap/releases/tag/v0.4.24","https://github.com/ruby/net-imap/releases/tag/v0.5.14","https://github.com/ruby/net-imap/releases/tag/v0.6.4"],"weaknesses":["CWE-93","CWE-77"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42257.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42257","state":"PUBLISHED","datePublished":"2026-05-09T19:39:48.398Z","dateUpdated":"2026-05-13T19:33:13.948Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-26T11:53:27.704Z"},"containers":{"cna":{"title":"net-imap: Command Injection via \"raw\" arguments to multiple commands","descriptions":[{"lang":"en","value":"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, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain CRLF sequences, which an attacker can use to inject arbitrary IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4."}],"affected":[{"vendor":"ruby","product":"net-imap","versions":[{"version":"< 0.4.24","status":"affected"},{"version":">= 0.5.0, < 0.5.14","status":"affected"},{"version":">= 0.6.0, < 0.6.4","status":"affected"}]}],"references":[{"url":"https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg","name":"https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/ruby/net-imap/releases/tag/v0.4.24","name":"https://github.com/ruby/net-imap/releases/tag/v0.4.24","tags":["x_refsource_MISC"]},{"url":"https://github.com/ruby/net-imap/releases/tag/v0.5.14","name":"https://github.com/ruby/net-imap/releases/tag/v0.5.14","tags":["x_refsource_MISC"]},{"url":"https://github.com/ruby/net-imap/releases/tag/v0.6.4","name":"https://github.com/ruby/net-imap/releases/tag/v0.6.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-93","lang":"en","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-77","lang":"en","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-09T19:39:48.398Z"},"source":{"advisory":"GHSA-hm49-wcqc-g2xg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T19:27:16.888782Z","id":"CVE-2026-42257","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T19:33:13.948Z"}}]}}}