{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-42257","sourceIdentifier":"security-advisories@github.com","published":"2026-05-09T20:16:28.463","lastModified":"2026-07-24T21:10:00.143","vulnStatus":"Analyzed","cveTags":[],"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."},{"lang":"es","value":"Net::IMAP implementa la funcionalidad de cliente del Protocolo de Acceso a Mensajes de Internet (IMAP) en Ruby. Antes de las versiones 0.4.24, 0.5.14 y 0.6.4, varios comandos de Net::IMAP aceptan un argumento de cadena sin procesar que se envía al servidor sin validación ni escape. Si esta cadena se deriva de una entrada controlada por el usuario, puede contener secuencias CRLF, que un atacante puede usar para inyectar comandos IMAP arbitrarios. Este problema ha sido parcheado en las versiones 0.4.24, 0.5.14 y 0.6.4."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"ruby","product":"net-imap","versions":[{"version":"\u003c 0.4.24","status":"affected"},{"version":"\u003e= 0.5.0, \u003c 0.5.14","status":"affected"},{"version":"\u003e= 0.6.0, \u003c 0.6.4","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":5.8,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-13T19:27:16.888782Z","id":"CVE-2026-42257","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-77"},{"lang":"en","value":"CWE-93"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ruby-lang:net\\:\\:imap:*:*:*:*:*:ruby:*:*","versionEndExcluding":"0.4.24","matchCriteriaId":"05DB8FF3-7546-470A-BBB4-4DCAEAD83D6F"},{"vulnerable":true,"criteria":"cpe:2.3:a:ruby-lang:net\\:\\:imap:*:*:*:*:*:ruby:*:*","versionStartIncluding":"0.5.0","versionEndExcluding":"0.5.14","matchCriteriaId":"2CCEB891-1D8F-4431-A79C-2A7560A84F4E"},{"vulnerable":true,"criteria":"cpe:2.3:a:ruby-lang:net\\:\\:imap:*:*:*:*:*:ruby:*:*","versionStartIncluding":"0.6.0","versionEndExcluding":"0.6.4","matchCriteriaId":"9A6D1995-BFA3-490F-967D-252CA7BE2264"}]}]}],"references":[{"url":"https://github.com/ruby/net-imap/releases/tag/v0.4.24","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/ruby/net-imap/releases/tag/v0.5.14","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/ruby/net-imap/releases/tag/v0.6.4","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}}