{"id":"CVE-2026-109297","summary":"Open WebUI 0.11.0 before 0.11.4 Denial of Service via Automation Recurrence Rules","details":"Open WebUI 0.11.0 before 0.11.4 contains a denial of service vulnerability in the automation recurrence-rule validator, whose sub-daily frequency guard parses rule text more strictly than the calendar library that executes it. Users permitted to create automations can submit whitespace-folded rules (or, in 0.11.0, lowercase frequencies or omitted RRULE prefixes) that expand per-second synchronously, blocking the shared event loop for minutes per request and on every scheduler poll.","aliases":["GHSA-whgc-vpjx-m3qh"],"modified":"2026-10-13T02:46:44.515485160Z","published":"2026-10-12T16:04:56.082Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-400"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109297.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109297.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-whgc-vpjx-m3qh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109297"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-denial-of-service-via-automation-recurrence-rules"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/open-webui/open-webui","events":[{"introduced":"f9590b8017199e56d5e953657e6498e3cef1d246"},{"fixed":"8bd8b4fac5e059578ac0c74b3c18d11139f88b7d"}],"database_specific":{"extracted_events":[{"introduced":"0.11.0"},{"fixed":"0.11.4"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.11.3","v0.11.2","v0.11.1","v0.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109297.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}