CVE-2026-77399

{"id": "CVE-2026-77399", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77399", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-23T14:10:14.416349Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "collective", "product": "icalendar", "versions": [{"status": "affected", "version": ">= 6.1.0, < 7.2.2"}]}]}], "published": "2026-09-22T19:16:51.443", "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"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-834"}]}], "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."}], "lastModified": "2026-09-23T18:12:04.247", "sourceIdentifier": "security-advisories@github.com"}