Open WebUI Multipart Boundary Denial of Service
Open WebUI
Open WebUI has a denial of service vulnerability in the file upload API endpoint caused by malformed multipart boundaries. Uploading files with excessive characters in the boundary causes continuous server processing and makes the application inaccessible.
disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why
- fix status
- Fix status unknown
- first report
- 20 Mar 2025
- last update
- 20 Mar 2025
Timeline · 1
Sources · 1
Advisories and databases
- 2025-03-20GHSA-6wj5-5pgr-jwq8: Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability in api/chat/fileGitHub Advisory Database · github.com/advisories/GHSA-6wj5-5pgr-jwq8
Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.
Classification
- lane
- Patch now
- AI role
- Attack on AI
- categories
- Infrastructure vulnerability
- severity
- 2 · Disclosed vulnerability
- fix status
- Fix status unknown
- targets
- Framework / tooling
- owasp llm top 10
- LLM03:2025 Supply Chain
- mitre atlas
- no technique for these categories
- dates
- happened 20 Mar 2025 · first reported 20 Mar 2025
- origin
- GitHub Advisory DatabaseVulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
- record
- confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 10:14Z
Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned
Copy a brief
This record as a short Markdown brief, for a ticket, a chat or a coding agent.
the brief as text
# Open WebUI Multipart Boundary Denial of Service https://gcdradar.vercel.app/incidents/ghsa-6wj5-5pgr-jwq8-open-webui-multipart-boundary-denial-of · AIR-2025-0233 · closed 2025-03-20 - Lane: Patch now - Severity: 2 (Disclosed vulnerability) - Fix status: Fix status unknown - First reported: 2025-03-20 - AI role: Attack on AI - Products: Open WebUI ## Summary Open WebUI has a denial of service vulnerability in the file upload API endpoint caused by malformed multipart boundaries. Uploading files with excessive characters in the boundary causes continuous server processing and makes the application inaccessible. ## What to do No action recorded; read the sources below and the vendor's advisory. ## Latest updates - 2025-03-20: GHSA-6wj5-5pgr-jwq8: Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability in api/chat/file (https://github.com/advisories/GHSA-6wj5-5pgr-jwq8) ## Sources - 2025-03-20 GitHub Advisory Database: GHSA-6wj5-5pgr-jwq8: Open WebUI Unauthenticated Multipart Boundary Denial of Service (DoS) Vulnerability in api/chat/file https://github.com/advisories/GHSA-6wj5-5pgr-jwq8 Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.
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