CVE-2026-70493

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-70493
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70493.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-70493
Aliases
Published
2026-08-04T20:56:20.541Z
Modified
2026-08-10T11:40:43.299795874Z
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: Any authenticated user can stall a worker via a knowledge-search pattern that backtracks catastrophically
Details

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/openwebui/tools/knowledgefs.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.

Database specific 
{
    "cwe_ids": [
        "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70493.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

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

Affected ranges

Type
GIT
Repo
https://github.com/open-webui/open-webui
Events
Introduced
1a97751e376e00a1897bc3679215ae1c7bd8fd42
Fixed
3ab2026262ef6f09810e4d235c5f9a9cb903e595
Fixed
f9590b8017199e56d5e953657e6498e3cef1d246
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0.9.6"
        },
        {
            "fixed": "0.11.0"
        }
    ]
}

Affected versions

v0.*
v0.9.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70493.json"