CVE-2026-59220

mediumCVSS 6.5covered by 1 sourcefirst seen 2026-07-09

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.

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Exploitation outlook

Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-59220: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9…nvd · 2026-07-09

External references

NVD record for CVE-2026-59220

CVE.org record

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