{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-77399 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-77399 is a medium-severity denial of service vulnerability in collective icalendar, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77399 and fix it if it is affected.\n\nWhat it is: CVE-2026-77399 is a medium-severity denial of service vulnerability in collective icalendar, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-77399 in the wild and no public exploit code.\n\nAffected product: collective icalendar. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-77399/ (Markdown: https://insights.sbomify.com/CVE-2026-77399/index.md)","id":"CVE-2026-77399","markdown":"https://insights.sbomify.com/CVE-2026-77399/index.md","name":"CVE-2026-77399","record":{"aliases":["DEBIAN-CVE-2026-77399","GHSA-qjcq-q7h7-r74v","UBUNTU-CVE-2026-77399"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python iCalendar library","requires_auth":"low_privilege","summary":"Attackers can cause denial of service in applications using the icalendar library by triggering unbounded expansion of VALARM REPEAT values.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-834","name":"Excessive Iteration"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"icalendar: Denial of service via unbounded VALARM REPEAT expansion","id":"CVE-2026-77399","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions","id":"CVE-2026-77401"},"packages":[],"prev":{"headline":"PJSIP: Heap buffer overflow in the AVI parser","id":"CVE-2026-77396"},"products":["icalendar"],"published":"2026-09-22","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-23","vendors":["collective"]},"summary":"Attackers can cause denial of service in applications using the icalendar library by triggering unbounded expansion of VALARM REPEAT values.","url":"https://insights.sbomify.com/CVE-2026-77399/"}