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CVE-2026-6608

lm-sys fastchat Arena Side-by-Side View add_text control flow

Published: Apr 20, 2026Updated: Apr 20, 2026 Sources: CVE List NVD
NVD MITRE
5.3CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-670

Affected Products

fastchat
lm-sys

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36
gist.github.com
https://github.com/lm-sys/FastChat/
github.com
https://github.com/lm-sys/FastChat/issues/3834
github.com
and 3 more references View all →

Timeline

Published
Apr 20, 2026
Last Updated
Apr 20, 2026

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