Denial of Service in lm-sys/fastchat
Priority HIGH 72CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
A Denial of Service (DoS) vulnerability exists in the file upload feature of lm-sys/fastchat version 0.2.36. The vulnerability is due to improper handling of form-data with a large filename in the file upload request. An attacker can exploit this by sending a payload with an excessively large filename, causing the server to become overwhelmed and unavailable to legitimate users.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00637 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| lm-sys | lm-sys/fastchat | up to latest | — | No fix listed | CNA |
| — | fschat (PyPI) | up to 0.2.36 | — | No fix listed | GHSA-79rp-v9rm-gxm8 |
- lm-sys/fastchat Vendorlm-sys Affected up to latest Fixed in — No fix listed CNA
- fschat (PyPI) Vendor— Affected up to 0.2.36 Fixed in — No fix listed GHSA-79rp-v9rm-gxm8
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-10912
- 2026-10-03 Alias added: GHSA-79rp-v9rm-gxm8
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
More lm-sys Fastchat vulnerabilities
- TI-2024-09320 SSRF in POST /worker_generate_stream API endpoint in lm-sys/fastchat CVSS 3.0CRITICAL 9.3
- TI-2024-11482 Server Side Request Forgery in lm-sys/fastchat CVSS 3.0HIGH 7.5
- TI-2024-10750 Server-Side Request Forgery in lm-sys/fastchat CVSS 3.0HIGH 7.5
- TI-2024-10111 Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat CVSS 3.0HIGH 7.5
- TI-2024-10112 Open Redirect in lm-sys/fastchat CVSS 3.0MEDIUM 6.1
Sources
- CVE-2024-10912 · CVE Program
- CVE-2024-10912 · NVD
- FIRST EPSS
- GHSA-79rp-v9rm-gxm8 · GitHub Advisory Database · CC BY 4.0
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