Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| lm-sys | lm-sys/fastchat | affected |
|
No data.
No data available yet.
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-7049 | In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of multipart boundaries. This flaw can be exploited by sending malformed multipart requests with arbitrary characters at the end of the boundary. Each extra character is processed in an infinite loop, leading to excessive resource consumption and a complete denial of service (DoS) for all users. The vulnerability is unauthenticated, meaning no user login or interaction is required for an attacker to exploit this issue. |
Github GHSA |
GHSA-qg86-f892-m4hj | FastChat Uncontrolled Resource Consumption vulnerability |
No CVSS v4.0
No CVSS v3.1
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.700% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-400 |
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-835 |
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Lm-sys
Lm-sys fastchat |
|
| CPEs | cpe:2.3:a:lm-sys:fastchat:0.2.36:*:*:*:*:*:*:* | |
| Vendors & Products |
Lm-sys
Lm-sys fastchat |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In lm-sys/fastchat Release v0.2.36, the server fails to handle excessive characters appended to the end of multipart boundaries. This flaw can be exploited by sending malformed multipart requests with arbitrary characters at the end of the boundary. Each extra character is processed in an infinite loop, leading to excessive resource consumption and a complete denial of service (DoS) for all users. The vulnerability is unauthenticated, meaning no user login or interaction is required for an attacker to exploit this issue. | |
| Title | Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat | |
| Weaknesses | CWE-400 | |
| References |
| |
| Metrics |
cvssV3_0
|