CVE-2024-10907 json
Denial of Service (DoS) via Multipart Boundary in lm-sys/fastchat
published 2025-03-20 19 mo ago modified 2026-07-07 4 mo ago also GHSA-qg86-f892-m4hj , PYSEC-2026-1398 , EUVD-2025-7049
- cvss
- 7.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 19 mo ago
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.com https://huntr.com/bounties/bf3ca81d-3508-4455-95d9-0b653e46d6e4 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| OSV | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | fschat | <=0.2.36 |
no fix listed |
Affected products
- lm-sys lm-sys/fastchat
Classification
References
-
huntr.com
/bounties/bf3ca81d-3508-4455-95d9-0b653e46d6e4
web, exploit, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2024-10907
advisory
-
github.com
/lm-sys/FastChat
package
-
pypi.org
/project/fschat
package
-
github.com
/advisories/GHSA-qg86-f892-m4hj
advisory
Sources
- CVE List CVE-2024-10907
- GitHub Advisory GHSA-qg86-f892-m4hj
- NVD CVE-2024-10907
- OSV PYSEC-2026-1398
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.