python-icalendar: icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python
CVE-2026-77399 is fixed in python-icalendar on 1 platform by DEBIAN-CVE-2026-77399 (version 7.3.0-1), released October 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-icalendar · Debian 14 | 7.3.0-1 | DEBIAN-CVE-2026-77399 | Oct 9, 2026 |
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