CVE-2026-59220
Medium · 6.5CVSS
6.5
EPSS
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Published
Jul 9, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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