| Component | Open WebUI |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-10-12 |
| Affected versions | >= 0.11.0, < 0.11.4 read from the advisory text: NVD has not published CPE data yet |
| Fixed in | 0.11.4 |
| Weakness | CWE-1333 |
| CISA KEV | not listed |
NVD description
Open WebUI from 0.11.0 before 0.11.4 contains a regular expression denial of service vulnerability that allows authenticated users to stall server workers via file search patterns. Attackers can instruct the model to call grep_knowledge_files or grep_chat_files with a catastrophically backtracking regex, blocking the event loop for two seconds per repeated call.
What to do
- Upgrade Open WebUI to
0.11.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-109295
- https://github.com/open-webui/open-webui/security/advisories/GHSA-gfjp-5hc9-852r
- https://www.vulncheck.com/advisories/open-webui-0.11.0-before-0.11.4-redos-via-grep-knowledge-files-event-loop
Read more
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