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CVE-2026-59220Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.2 before 0.10.0, the SKILL_MENTION_RE and strip_re regular expressions in backend/open_webui/utils/middleware.py parsed <$skillId|label> skill mentions with overlapping quantifiers, allowing an authenticated chat message containing <$ without a closing > to trigger quadratic backtracking and block the asyncio event loop. This issue is fixed in version 0.10.0.
6.5 MEDIUMEPSS 0.57%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.5 | MEDIUM | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-59220
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-07-10 18:15 UTC
- Weaknesses
- CWE-1333 · Inefficient Regular Expression Complexity
Affected Products
As published by the CNA in the CVE record.
open-webuiopen-webui1 version range
- >= 0.9.2, < 0.10.0