CVE-2026-6608
6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Summary
A vulnerability was detected in lm-sys fastchat up to 0.2.36. Impacted is the function add_text of the component Arena Side-by-Side View Handler. The manipulation results in incorrect control flow. The attack can be launched remotely. The exploit is now public and may be used. The root cause was fixed in commit 34eca62 for gradio_block_arena_named.py, but three other files were missed.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| lm-sys | fastchat | 0.2.0 | affected |
| lm-sys | fastchat | 0.2.1 | affected |
| lm-sys | fastchat | 0.2.2 | affected |
| lm-sys | fastchat | 0.2.3 | affected |
| lm-sys | fastchat | 0.2.4 | affected |
| lm-sys | fastchat | 0.2.5 | affected |
| lm-sys | fastchat | 0.2.6 | affected |
| lm-sys | fastchat | 0.2.7 | affected |
| lm-sys | fastchat | 0.2.8 | affected |
| lm-sys | fastchat | 0.2.9 | affected |
| lm-sys | fastchat | 0.2.10 | affected |
| lm-sys | fastchat | 0.2.11 | affected |
| lm-sys | fastchat | 0.2.12 | affected |
| lm-sys | fastchat | 0.2.13 | affected |
| lm-sys | fastchat | 0.2.14 | affected |
| lm-sys | fastchat | 0.2.15 | affected |
| lm-sys | fastchat | 0.2.16 | affected |
| lm-sys | fastchat | 0.2.17 | affected |
| lm-sys | fastchat | 0.2.18 | affected |
| lm-sys | fastchat | 0.2.19 | affected |
| lm-sys | fastchat | 0.2.20 | affected |
| lm-sys | fastchat | 0.2.21 | affected |
| lm-sys | fastchat | 0.2.22 | affected |
| lm-sys | fastchat | 0.2.23 | affected |
| lm-sys | fastchat | 0.2.24 | affected |
| lm-sys | fastchat | 0.2.25 | affected |
| lm-sys | fastchat | 0.2.26 | affected |
| lm-sys | fastchat | 0.2.27 | affected |
| lm-sys | fastchat | 0.2.28 | affected |
| lm-sys | fastchat | 0.2.29 | affected |
| lm-sys | fastchat | 0.2.30 | affected |
| lm-sys | fastchat | 0.2.31 | affected |
| lm-sys | fastchat | 0.2.32 | affected |
| lm-sys | fastchat | 0.2.33 | affected |
| lm-sys | fastchat | 0.2.34 | affected |
| lm-sys | fastchat | 0.2.35 | affected |
| lm-sys | fastchat | 0.2.36 | affected |
Weaknesses
- CWE-670: Incorrect Control Flow
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
References
- https://vuldb.com/vuln/358243
- https://vuldb.com/vuln/358243/cti
- https://vuldb.com/submit/792228
- https://github.com/lm-sys/FastChat/issues/3834
- https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36
- https://github.com/lm-sys/FastChat/
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.