{"cve":"CVE-2026-88000","nvd":{"published":"2026-09-09T22:18:48.777","modified":"2026-09-14T17:48:49.137","status":"Analyzed","description":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/chats/{id}/messages/{message_id} used the chat-history deletion helper in backend/open_webui/models/chats.py to follow childrenIds without recording visited message identifiers. An authenticated user could store a cyclic chat tree and delete a message, causing a synchronous infinite loop on the server request loop that blocked every user's requests until the process was killed. This issue is fixed in version 0.11.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-835"],"references":["https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc","https://github.com/open-webui/open-webui/pull/28035","https://github.com/open-webui/open-webui/releases/tag/v0.11.1","https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2","https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2"],"products":["openwebui:open_webui"],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-88000","score":0.00592,"percentile":0.48325,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3cgp-3cqx-j8w2","url":"https://osv.dev/vulnerability/GHSA-3cgp-3cqx-j8w2","summary":"Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree","modified":"2026-09-10T12:25:36.498501441Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.10.0 <0.11.1"],"fixed":["0.11.1"]}]},{"id":"PYSEC-2026-3877","url":"https://osv.dev/vulnerability/PYSEC-2026-3877","summary":"Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree","modified":"2026-09-10T12:15:09.104164226Z","packages":[{"ecosystem":"PyPI","name":"open-webui","purl":"pkg:pypi/open-webui","ranges":[">=0.10.0 <0.11.1"],"fixed":["0.11.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}