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
Published
2026-07-09T16:09:41Z
Modified
2026-10-28T02:30:35Z
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 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.

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
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0.9.2"
                },
                {
                    "fixed":  "0.10.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "61a26722155ec6ee1b629cf8dfcf975098c18331"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v0.10.0",
            "range":  [
                {
                    "fixed":  "4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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"