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| Source | ID | Title |
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Github GHSA |
GHSA-cv84-9p8j-fj68 | icalendar has Algorithmic Complexity in Equality |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Wed, 26 Aug 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Tue, 25 Aug 2026 21:30:00 +0000
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| References |
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Tue, 25 Aug 2026 19:45:00 +0000
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| Description | icalendar is an RFC 5545 compatible parser and generator of iCalendar files for Python. From 7.1.0 until 7.1.3, the Component equality method in src/icalendar/cal/component.py compares nested subcomponents with two membership loops, and each membership test invokes the same method on child components, causing O(2^n) work relative to nesting depth. Component.from_ical accepts arbitrarily nested BEGIN:VEVENT blocks without a depth limit, so an attacker can submit a sub-kilobyte .ics file containing equal nested subtrees and trigger the cost when an application performs equality, inequality, membership, deduplication, test-assertion, round-trip, or normalization comparisons. Parsing alone does not trigger the issue, and comparisons that differ early short-circuit, but a few hundred bytes can pin a CPU core for minutes or indefinitely, causing denial of service in calendar sync or import endpoints, invite processing, and other comparison paths. This issue is fixed in version 7.1.3. | |
| Title | icalendar: Algorithmic Complexity in Equality | |
| Weaknesses | CWE-400 CWE-407 |
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| References |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-26T15:05:26.062Z
Reserved: 2026-06-16T14:41:54.579Z
Link: CVE-2026-55099
Updated: 2026-08-25T20:10:56.453Z
Status : Received
Published: 2026-08-25T20:16:56.940
Modified: 2026-08-26T16:16:28.197
Link: CVE-2026-55099
No data.
OpenCVE Enrichment
Updated: 2026-08-25T21:45:03Z
Github GHSA