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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-6608
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-20 06:16:21 UTC
Updated2026-04-20 06:16:21 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 5.5 MEDIUM from [email protected]

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-670 | CWE-670 Incorrect Control Flow

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.5MEDIUMCVSS: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/C...
4.0CNADECLARED6.9MEDIUMCVSS: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
3.1[email protected]Primary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.0CNADECLARED5.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
2.0[email protected]Secondary5AV:N/AC:L/Au:N/C:N/I:P/A:N
2.0CNADECLARED5AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lm-sys Fastchat affected 0.2.0 Not specified
CNA Lm-sys Fastchat affected 0.2.1 Not specified
CNA Lm-sys Fastchat affected 0.2.2 Not specified
CNA Lm-sys Fastchat affected 0.2.3 Not specified
CNA Lm-sys Fastchat affected 0.2.4 Not specified
CNA Lm-sys Fastchat affected 0.2.5 Not specified
CNA Lm-sys Fastchat affected 0.2.6 Not specified
CNA Lm-sys Fastchat affected 0.2.7 Not specified
CNA Lm-sys Fastchat affected 0.2.8 Not specified
CNA Lm-sys Fastchat affected 0.2.9 Not specified
CNA Lm-sys Fastchat affected 0.2.10 Not specified
CNA Lm-sys Fastchat affected 0.2.11 Not specified
CNA Lm-sys Fastchat affected 0.2.12 Not specified
CNA Lm-sys Fastchat affected 0.2.13 Not specified
CNA Lm-sys Fastchat affected 0.2.14 Not specified
CNA Lm-sys Fastchat affected 0.2.15 Not specified
CNA Lm-sys Fastchat affected 0.2.16 Not specified
CNA Lm-sys Fastchat affected 0.2.17 Not specified
CNA Lm-sys Fastchat affected 0.2.18 Not specified
CNA Lm-sys Fastchat affected 0.2.19 Not specified
CNA Lm-sys Fastchat affected 0.2.20 Not specified
CNA Lm-sys Fastchat affected 0.2.21 Not specified
CNA Lm-sys Fastchat affected 0.2.22 Not specified
CNA Lm-sys Fastchat affected 0.2.23 Not specified
CNA Lm-sys Fastchat affected 0.2.24 Not specified
CNA Lm-sys Fastchat affected 0.2.25 Not specified
CNA Lm-sys Fastchat affected 0.2.26 Not specified
CNA Lm-sys Fastchat affected 0.2.27 Not specified
CNA Lm-sys Fastchat affected 0.2.28 Not specified
CNA Lm-sys Fastchat affected 0.2.29 Not specified
CNA Lm-sys Fastchat affected 0.2.30 Not specified
CNA Lm-sys Fastchat affected 0.2.31 Not specified
CNA Lm-sys Fastchat affected 0.2.32 Not specified
CNA Lm-sys Fastchat affected 0.2.33 Not specified
CNA Lm-sys Fastchat affected 0.2.34 Not specified
CNA Lm-sys Fastchat affected 0.2.35 Not specified
CNA Lm-sys Fastchat affected 0.2.36 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/358243/cti [email protected] vuldb.com
vuldb.com/submit/792228 [email protected] vuldb.com
github.com/lm-sys/FastChat [email protected] github.com
github.com/lm-sys/FastChat/issues/3834 [email protected] github.com
vuldb.com/vuln/358243 [email protected] vuldb.com
gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36 [email protected] gist.github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Eric-f (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-19T00:00:00.000ZAdvisory disclosed
CNA2026-04-19T02:00:00.000ZVulDB entry created
CNA2026-04-19T18:04:52.000ZVulDB entry last update
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