CVE-2026-6608

medium

Description

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.

References

https://vuldb.com/vuln/358243/cti

https://vuldb.com/vuln/358243

https://vuldb.com/submit/792228

https://github.com/lm-sys/FastChat/issues/3834

https://github.com/lm-sys/FastChat/

https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36

Details

Source: Mitre, NVD

Published: 2026-04-20

Updated: 2026-04-20

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 6.9

Vector: 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

Severity: Medium