CVE-2026-109295
Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loop
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 12, 2026
- Updated
- Oct 23, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-1333 Inefficient Regular Expression Complexity
Affected Products
| Product | Versions |
|---|---|
open-webuiopen-webui |
|
References
- GitHub Security Advisory (GHSA-gfjp-5hc9-852r)vendor-advisory
- VulnCheck Advisory: Open WebUI 0.11.0 before 0.11.4 ReDoS via grep_knowledge_files Event Loopthird-party-advisory
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