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CVE-2026-59220

Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
open-webui / open-webuiaffected >= 0.9.2, < 0.10.0

CWE

CWE-1333

References

ADP enrichment

CISA-ADP

No English description supplied.