CVE-2026-59220

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Source

https://cve.org/CVERecord?id=CVE-2026-59220

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59220.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-59220

Aliases

GHSA-ffpj-xv5c-p3gw

Published

2026-07-09T16:09:41.127Z

Modified

2026-07-15T01:49:16.514748564Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

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

Details

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.2 before 0.10.0, the SKILLMENTIONRE and stripre regular expressions in backend/openwebui/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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59220.json"
}

References

Affected packages

Git / github.com/open-webui/open-webui

Affected ranges

Type

GIT

Repo

https://github.com/open-webui/open-webui

Events

Introduced

8dae237a0bfdac4b7f55b463b3e2769ea4b94a0b

Fixed

4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c

Fixed

61a26722155ec6ee1b629cf8dfcf975098c18331

Database specific

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.9.2"
        },
        {
            "fixed": "0.10.0"
        }
    ]
}

Affected versions

v0.*

v0.9.2

v0.9.3

v0.9.4

v0.9.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59220.json"