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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.00034.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
lm-sys fastchat affected
Version Status Constraints
0.2.0 affected —
0.2.1 affected —
0.2.2 affected —
0.2.3 affected —
0.2.4 affected —
0.2.5 affected —
0.2.6 affected —
0.2.7 affected —
0.2.8 affected —
0.2.9 affected —
0.2.10 affected —
0.2.11 affected —
0.2.12 affected —
0.2.13 affected —
0.2.14 affected —
0.2.15 affected —
0.2.16 affected —
0.2.17 affected —
0.2.18 affected —
0.2.19 affected —
0.2.20 affected —
0.2.21 affected —
0.2.22 affected —
0.2.23 affected —
0.2.24 affected —
0.2.25 affected —
0.2.26 affected —
0.2.27 affected —
0.2.28 affected —
0.2.29 affected —
0.2.30 affected —
0.2.31 affected —
0.2.32 affected —
0.2.33 affected —
0.2.34 affected —
0.2.35 affected —
0.2.36 affected —

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Lm-sys Subscribe
Fastchat Subscribe

Project Subscriptions

Vendors Products
Lm-sys Subscribe
Fastchat Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36 cve-icon cve-icon
https://github.com/lm-sys/FastChat/ cve-icon cve-icon
https://github.com/lm-sys/FastChat/issues/3834 cve-icon cve-icon
https://vuldb.com/submit/792228 cve-icon cve-icon
https://vuldb.com/vuln/358243 cve-icon cve-icon
https://vuldb.com/vuln/358243/cti cve-icon cve-icon
History

Mon, 20 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 20 Apr 2026 06:15:00 +0000

Type Values Removed Values Added
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.
Title lm-sys fastchat Arena Side-by-Side View add_text control flow
First Time appeared Lm-sys
Lm-sys fastchat
Weaknesses CWE-670
CPEs cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*
Vendors & Products Lm-sys
Lm-sys fastchat
References
Metrics cvssV2_0

{'score': 5, 'vector': 'AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 5.3, 'vector': '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'}

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV4_0

{'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/E:P'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-04-20T14:57:55.071Z

Reserved: 2026-04-19T15:59:43.122Z

Link: CVE-2026-6608

cve-icon Vulnrichment

Updated: 2026-04-20T14:57:50.383Z

cve-icon NVD

Status : Received

Published: 2026-04-20T06:16:21.733

Modified: 2026-04-20T06:16:21.733

Link: CVE-2026-6608

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-20T08:00:09Z

Weaknesses