CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2026-59220
Medium (6.5) in openwebui open webui. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in open-webui 0.10.0.
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.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
- CWE
- CWE-1333
- Published
- Modified
- Record from
- the NVD, synced
Affected
- openwebui:open_webui
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-ffpj-xv5c-p3gw | PyPI | open-webui | >=0.9.2 <0.10.0 | 0.10.0 |
| PYSEC-2026-3596 | PyPI | open-webui | >=0.9.2 <0.10.0 | 0.10.0 |
References
- https://github.com/open-webui/open-webui/commit/61a26722155ec6ee1b629cf8dfcf975098c18331
- https://github.com/open-webui/open-webui/releases/tag/v0.10.0
- https://github.com/open-webui/open-webui/security/advisories/GHSA-ffpj-xv5c-p3gw
- https://github.com/open-webui/open-webui/security/advisories/GHSA-ffpj-xv5c-p3gw