{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77399","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-20T19:55:27.023Z","datePublished":"2026-09-22T18:58:56.647Z","dateUpdated":"2026-09-23T14:36:47.671Z"},"containers":{"cna":{"title":"icalendar: Denial of service via unbounded VALARM REPEAT expansion","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-834","lang":"en","description":"CWE-834: Excessive Iteration","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v"},{"name":"https://github.com/collective/icalendar/pull/1571","tags":["x_refsource_MISC"],"url":"https://github.com/collective/icalendar/pull/1571"},{"name":"https://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267","tags":["x_refsource_MISC"],"url":"https://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267"},{"name":"https://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219","tags":["x_refsource_MISC"],"url":"https://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219"},{"name":"https://github.com/collective/icalendar/releases/tag/v7.2.2","tags":["x_refsource_MISC"],"url":"https://github.com/collective/icalendar/releases/tag/v7.2.2"}],"affected":[{"vendor":"collective","product":"icalendar","versions":[{"version":">= 6.1.0, < 7.2.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-22T18:58:56.647Z"},"descriptions":[{"lang":"en","value":"icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 6.1.0 until 7.2.2, vInt.from_ical accepts an attacker-controlled VALARM REPEAT value and applications that request alarm times can eagerly expand it without an application-level limit. Alarms.times and Alarms.active reach the unbounded expansion in versions starting with 6.1.0, while Alarm.triggers adds a second affected path starting with 7.0.0. Parsing alone does not trigger the issue, but accessing these properties can consume excessive CPU time and heap memory and terminate or stall a service. This issue is fixed in version 7.2.2."}],"source":{"advisory":"GHSA-qjcq-q7h7-r74v","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T14:10:14.416349Z","id":"CVE-2026-77399","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-23T14:36:47.671Z"}}]}}