What is CVE-2026-59220?

CVE-2026-59220 is a medium-severity vulnerability in Open-webui, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-07-09.

How severe is CVE-2026-59220?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Open-webui

CVE-2026-59220

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 m…

Vulnerability class: ReDoS (Regular Expression Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Open-webui — versions >= 0.9.2, < 0.10.0

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-59220?: CVE-2026-59220 is a medium-severity vulnerability in Open-webui, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-07-09.
How severe is CVE-2026-59220?: Medium severity. CVSS v3 base score is 6.5 out of 10.