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.
Metrics
Affected Vendors & Products
References
History
Thu, 09 Jul 2026 19:30:00 +0000
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ssvc
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Thu, 09 Jul 2026 17:45:00 +0000
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| First Time appeared |
Open-webui
Open-webui open-webui |
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| Vendors & Products |
Open-webui
Open-webui open-webui |
Thu, 09 Jul 2026 16:30:00 +0000
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| Description | 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. | |
| Title | Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config | |
| Weaknesses | CWE-1333 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-09T18:45:06.768Z
Reserved: 2026-07-02T21:05:02.925Z
Link: CVE-2026-59220
Updated: 2026-07-09T18:44:39.884Z
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OpenCVE Enrichment
Updated: 2026-07-09T17:30:17Z