{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42256", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-26T11:53:27.704Z", "datePublished": "2026-05-09T19:38:33.106Z", "dateUpdated": "2026-05-09T19:38:33.106Z"}, "containers": {"cna": {"title": "net-imap: Denial of service via high iteration count for `SCRAM-*` authentication", "problemTypes": [{"descriptions": [{"cweId": "CWE-1322", "lang": "en", "description": "CWE-1322: Use of Blocking Code in Single-threaded, Non-blocking Context", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6, "baseSeverity": "MEDIUM", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7"}, {"name": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612"}, {"name": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4"}, {"name": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758"}, {"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"}, {"name": "https://github.com/ruby/net-imap/releases/tag/v0.6.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/ruby/net-imap/releases/tag/v0.6.4"}], "affected": [{"vendor": "ruby", "product": "net-imap", "versions": [{"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": "2026-05-09T19:38:33.106Z"}, "descriptions": [{"lang": "en", "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4."}], "source": {"advisory": "GHSA-87pf-fpwv-p7m7", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4."}], "id": "CVE-2026-42256", "lastModified": "2026-05-09T20:16:28.313", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "baseSeverity": "MEDIUM", "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:N/VI:N/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-05-09T20:16:28.313", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/158d0b505074397cdb5ceb58935e42dd2bcfa612"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/808001bc45c06f7297a7e96d341279e041a7f7f4"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/commit/99f59eab6064955a23debd95410263ad144df758"}, {"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/releases/tag/v0.6.4"}, {"source": "security-advisories@github.com", "url": "https://github.com/ruby/net-imap/security/advisories/GHSA-87pf-fpwv-p7m7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}, {"lang": "en", "value": "CWE-1322"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-05-09T21:30:42.096984+00:00", "updated": "2026-05-09T21:30:42.097000+00:00", "vendors": []}