{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42246", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-25T05:37:12.118Z", "datePublished": "2026-05-09T19:33:17.880Z", "dateUpdated": "2026-05-12T02:29:15.333Z"}, "containers": {"cna": {"title": "net-imap vulnerable to STARTTLS stripping via invalid response timing", "problemTypes": [{"descriptions": [{"cweId": "CWE-392", "lang": "en", "description": "CWE-392: Missing Report of Error Condition", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-393", "lang": "en", "description": "CWE-393: Return of Wrong Status Code", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-754", "lang": "en", "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-636", "lang": "en", "description": "CWE-636: Not Failing Securely ('Failing Open')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-841", "lang": "en", "description": "CWE-841: Improper Enforcement of Behavioral Workflow", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.6, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp"}, {"name": "https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618"}, {"name": "https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e"}, {"name": "https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c"}, {"name": "https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da"}, {"name": "https://github.com/ruby/net-imap/releases/tag/v0.3.10", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/releases/tag/v0.3.10"}, {"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/v0.4.24"}, {"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/v0.5.14"}], "affected": [{"vendor": "ruby", "product": "net-imap", "versions": [{"version": "< 0.3.10", "status": "affected"}, {"version": ">= 0.4.0, < 0.4.24", "status": "affected"}, {"version": ">= 0.5.0, < 0.5.14", "status": "affected"}, {"version": ">= 0.6.0, < 0.6.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-09T19:33:17.880Z"}, "descriptions": [{"lang": "en", "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return \"successfully\", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4."}], "source": {"advisory": "GHSA-vcgp-9326-pqcp", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-12T02:29:05.120225Z", "id": "CVE-2026-42246", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-12T02:29:15.333Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42246", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-12T02:29:05.120225Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-12T02:29:10.449Z"}}], "cna": {"title": "net-imap vulnerable to STARTTLS stripping via invalid response timing", "source": {"advisory": "GHSA-vcgp-9326-pqcp", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 7.6, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N", "userInteraction": "PASSIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}], "affected": [{"vendor": "ruby", "product": "net-imap", "versions": [{"status": "affected", "version": "< 0.3.10"}, {"status": "affected", "version": ">= 0.4.0, < 0.4.24"}, {"status": "affected", "version": ">= 0.5.0, < 0.5.14"}, {"status": "affected", "version": ">= 0.6.0, < 0.6.4"}]}], "references": [{"url": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp", "name": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618", "name": "https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e", "name": "https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c", "name": "https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da", "name": "https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ruby/net-imap/releases/tag/v0.3.10", "name": "https://github.com/ruby/net-imap/releases/tag/v0.3.10", "tags": ["x_refsource_MISC"]}, {"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"]}], "descriptions": [{"lang": "en", "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return \"successfully\", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-392", "description": "CWE-392: Missing Report of Error Condition"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-393", "description": "CWE-393: Return of Wrong Status Code"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-754", "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-636", "description": "CWE-636: Not Failing Securely ('Failing Open')"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-841", "description": "CWE-841: Improper Enforcement of Behavioral Workflow"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-09T19:33:17.880Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42246", "state": "PUBLISHED", "dateUpdated": "2026-05-12T02:29:15.333Z", "dateReserved": "2026-04-25T05:37:12.118Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-09T19:33:17.880Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4, a man-in-the-middle attacker can cause Net::IMAP#starttls to return \"successfully\", without starting TLS. This issue has been patched in versions 0.3.10, 0.4.24, 0.5.14, and 0.6.4."}], "id": "CVE-2026-42246", "lastModified": "2026-05-13T15:39:39.350", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-05-09T20:16:28.163", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/0ede4c40b1523dfeaf95777b2678e54cc0fd9618"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/24a4e770b43230286a05aa2a9746cdbb3eb8485e"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/97e2488fb5401a1783bddd959dde007d9fbce42c"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/f79d35bf5833f186e81044c57c843eda30c873da"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/releases/tag/v0.3.10"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/releases/tag/v0.4.24"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/releases/tag/v0.5.14"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-vcgp-9326-pqcp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-392"}, {"lang": "en", "value": "CWE-393"}, {"lang": "en", "value": "CWE-636"}, {"lang": "en", "value": "CWE-754"}, {"lang": "en", "value": "CWE-841"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.3.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.4.0,0.4.24)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.5.0,0.5.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.6.0,0.6.4)"}}], "enrichment": {"confidence": 81.0, "confidence_source": "matching", "scores": [{"score": 81.0, "source": "matching"}]}, "original": {"product": "net-imap", "source": "cna", "vendor": "ruby"}, "product": "net::imap", "vendor": "ruby-lang"}], "created": "2026-05-09T21:30:42.097470+00:00", "updated": "2026-05-10T20:00:05.890984+00:00", "vendors": ["ruby-lang", "ruby-lang$PRODUCT$net::imap"]}