CVE-2026-6608

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 v3 5.3 MEDIUM
CVSS v2.0 5.0 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36
https://github.com/lm-sys/FastChat/
https://github.com/lm-sys/FastChat/issues/3834
https://vuldb.com/submit/792228
https://vuldb.com/vuln/358243
https://vuldb.com/vuln/358243/cti

Configurations

No configuration.

History

26 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Una vulnerabilidad fue detectada en lm-sys fastchat hasta la versión 0.2.36. La función afectada es add_text del componente Gestor de Vista Lado a Lado de Arena. La manipulación resulta en un flujo de control incorrecto. El ataque puede lanzarse remotamente. El exploit ahora es público y puede ser utilizado. La causa raíz fue corregida en el commit 34eca62 para gradio_block_arena_named.py, pero se pasaron por alto otros tres archivos.

Information

Published : 2026-04-20 06:16

Updated : 2026-10-26 21:10

NVD link : CVE-2026-6608

Mitre link : CVE-2026-6608

CVE.ORG link : CVE-2026-6608

JSON object : View

Products Affected

No product.

CWE

CWE-670

Always-Incorrect Control Flow Implementation

{"id": "CVE-2026-6608", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6608", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-20T14:57:43.886595Z"}}], "cvssMetricV2": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@vuldb.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 5.5, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "PROOF_OF_CONCEPT", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "cna@vuldb.com", "affectedData": [{"cpes": ["cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*"], "vendor": "lm-sys", "modules": ["Arena Side-by-Side View Handler"], "product": "fastchat", "versions": [{"status": "affected", "version": "0.2.0"}, {"status": "affected", "version": "0.2.1"}, {"status": "affected", "version": "0.2.2"}, {"status": "affected", "version": "0.2.3"}, {"status": "affected", "version": "0.2.4"}, {"status": "affected", "version": "0.2.5"}, {"status": "affected", "version": "0.2.6"}, {"status": "affected", "version": "0.2.7"}, {"status": "affected", "version": "0.2.8"}, {"status": "affected", "version": "0.2.9"}, {"status": "affected", "version": "0.2.10"}, {"status": "affected", "version": "0.2.11"}, {"status": "affected", "version": "0.2.12"}, {"status": "affected", "version": "0.2.13"}, {"status": "affected", "version": "0.2.14"}, {"status": "affected", "version": "0.2.15"}, {"status": "affected", "version": "0.2.16"}, {"status": "affected", "version": "0.2.17"}, {"status": "affected", "version": "0.2.18"}, {"status": "affected", "version": "0.2.19"}, {"status": "affected", "version": "0.2.20"}, {"status": "affected", "version": "0.2.21"}, {"status": "affected", "version": "0.2.22"}, {"status": "affected", "version": "0.2.23"}, {"status": "affected", "version": "0.2.24"}, {"status": "affected", "version": "0.2.25"}, {"status": "affected", "version": "0.2.26"}, {"status": "affected", "version": "0.2.27"}, {"status": "affected", "version": "0.2.28"}, {"status": "affected", "version": "0.2.29"}, {"status": "affected", "version": "0.2.30"}, {"status": "affected", "version": "0.2.31"}, {"status": "affected", "version": "0.2.32"}, {"status": "affected", "version": "0.2.33"}, {"status": "affected", "version": "0.2.34"}, {"status": "affected", "version": "0.2.35"}, {"status": "affected", "version": "0.2.36"}]}]}], "published": "2026-04-20T06:16:21.733", "references": [{"url": "https://gist.github.com/YLChen-007/e45039d23e698222d887ee09735d9d36", "source": "cna@vuldb.com"}, {"url": "https://github.com/lm-sys/FastChat/", "source": "cna@vuldb.com"}, {"url": "https://github.com/lm-sys/FastChat/issues/3834", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/submit/792228", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/vuln/358243", "source": "cna@vuldb.com"}, {"url": "https://vuldb.com/vuln/358243/cti", "source": "cna@vuldb.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "cna@vuldb.com", "description": [{"lang": "en", "value": "CWE-670"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Una vulnerabilidad fue detectada en lm-sys fastchat hasta la versi\u00f3n 0.2.36. La funci\u00f3n afectada es add_text del componente Gestor de Vista Lado a Lado de Arena. La manipulaci\u00f3n resulta en un flujo de control incorrecto. El ataque puede lanzarse remotamente. El exploit ahora es p\u00fablico y puede ser utilizado. La causa ra\u00edz fue corregida en el commit 34eca62 para gradio_block_arena_named.py, pero se pasaron por alto otros tres archivos."}], "lastModified": "2026-10-26T21:10:00.170", "sourceIdentifier": "cna@vuldb.com"}