CVE Catalog

CVE-2026-70493

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.31%

23th percentile - higher than 23% of all known CVEs

Summary

Open WebUI versions 0.9.6 through 0.11.0 have a DoS vulnerability in the knowledge search path. Patterns containing regex metacharacters are compiled with Python's backtracking re engine and run without time limit, allowing an attacker to pin a CPU core and block the event loop. The issue is fixed in version 0.11.0.

Risk Assessment

An attacker can cause service unavailability for all users, leading to downtime and potential financial losses.

Recommendation

Update Open WebUI to version 0.11.0 or later, which includes the fix.

Other vulnerabilities in Open WebUI

See all
Original NVD description (English source)

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the built-in knowledge search path in backend/open_webui/tools/knowledge_fs.py and backend/open_webui/tools/builtin.py let a chat participant choose a pattern used to grep knowledge files. Patterns containing regex metacharacters were compiled with Python's backtracking re engine and run against every line of every reachable file with no time limit, so a crafted pattern such as (x|x)*y and one matching uploaded file line can pin one CPU core and block the event loop. This causes availability impact for every other user of the affected worker. This issue is fixed in 0.11.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS