{"id":"CVE-2026-77399","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-77399","generatedAt":"2026-10-28T02:21:48.827Z","title":"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.","description":"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.","published":"2026-09-22T19:16:51.000Z","lastModified":"2026-09-23T18:12:04.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400","CWE-834"],"affected":[],"epss":{"score":0.00312,"percentile":0.23834,"date":"2026-10-26","history":[{"date":"2026-09-23","score":0.00548,"percentile":0.44807}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-22T19:16:51.000Z","detail":{"score":"6.5","severity":"MEDIUM","publishedAt":"2026-09-22T19:16:51.443Z"},"summary":"New CVE, medium severity (CVSS 6.5)."}],"references":[{"url":"https://github.com/collective/icalendar/commit/157f85137c65565a308bbcf4fdcc7d8ebce01267","source":"security-advisories@github.com"},{"url":"https://github.com/collective/icalendar/commit/cddd37226adbc52cca52a399f61d38a378221219","source":"security-advisories@github.com"},{"url":"https://github.com/collective/icalendar/pull/1571","source":"security-advisories@github.com"},{"url":"https://github.com/collective/icalendar/releases/tag/v7.2.2","source":"security-advisories@github.com"},{"url":"https://github.com/collective/icalendar/security/advisories/GHSA-qjcq-q7h7-r74v","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-77399","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}