CVE-2026-6608
lm-sys fastchat Arena Side-by-Side View add_text control flow
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 6.9EPSS 0.3%KEV nãoPoC públicaPatch —
Lifecycle
20 Apr 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
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
Affected products
lm-sys · fastchatpublic PoCs found — 1
cve_referencegist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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