CVE-2026-6607
Full vulnerability record from the local CVENow database.
Description
A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function api_generate of the component Worker API Endpoint. The manipulation leads to resource consumption. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is c9e84b89c91d45191dc24466888de526fa04cf33. It is suggested to install a patch to address this issue. Commit ff66426 patched this issue in api_generate of base_model_worker.py and did miss other entry points.
Severity
MEDIUM
CVSS score
5.5
(v4.0)
Vulnerability status
Deferred
Source identifier
Published
2026-04-20 05:16:16.190000
Last modified
2026-10-26 22:10:00.163000
View original CVE JSON
{
"id": "CVE-2026-6607",
"sourceIdentifier": "[email protected]",
"published": "2026-04-20T05:16:16.190",
"lastModified": "2026-10-26T22:10:00.163",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A security vulnerability has been detected in lm-sys fastchat up to 0.2.36. This issue affects the function api_generate of the component Worker API Endpoint. The manipulation leads to resource consumption. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The identifier of the patch is c9e84b89c91d45191dc24466888de526fa04cf33. It is suggested to install a patch to address this issue. Commit ff66426 patched this issue in api_generate of base_model_worker.py and did miss other entry points."
},
{
"lang": "es",
"value": "Una vulnerabilidad de seguridad ha sido detectada en lm-sys fastchat hasta 0.2.36. Este problema afecta la función api_generate del componente Worker API Endpoint. La manipulación conduce a consumo de recursos. El ataque puede ser iniciado remotamente. El exploit ha sido divulgado públicamente y puede ser utilizado. El identificador del parche es c9e84b89c91d45191dc24466888de526fa04cf33. Se sugiere instalar un parche para abordar este problema. El commit ff66426 parcheó este problema en api_generate de base_model_worker.py y omitió otros puntos de entrada."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "lm-sys",
"product": "fastchat",
"cpes": [
"cpe:2.3:a:lm-sys:fastchat:*:*:*:*:*:*:*:*"
],
"modules": [
"Worker API Endpoint"
],
"versions": [
{
"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",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "PROOF_OF_CONCEPT",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "LOW"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
],
"cvssMetricV2": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "2.0",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"baseScore": 5.0,
"accessVector": "NETWORK",
"accessComplexity": "LOW",
"authentication": "NONE",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "PARTIAL"
},
"baseSeverity": "MEDIUM",
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"acInsufInfo": false,
"obtainAllPrivilege": false,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-04-20T11:36:33.963840Z",
"id": "CVE-2026-6607",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-400"
},
{
"lang": "en",
"value": "CWE-404"
}
]
}
],
"references": [
{
"url": "https://gist.github.com/YLChen-007/87216a2d97a882d619e11dc67cd473b5",
"source": "[email protected]"
},
{
"url": "https://github.com/lm-sys/FastChat/",
"source": "[email protected]"
},
{
"url": "https://github.com/lm-sys/FastChat/commit/c9e84b89c91d45191dc24466888de526fa04cf33",
"source": "[email protected]"
},
{
"url": "https://github.com/lm-sys/FastChat/issues/3833",
"source": "[email protected]"
},
{
"url": "https://github.com/lm-sys/FastChat/pull/3835",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/submit/792227",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/vuln/358242",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/vuln/358242/cti",
"source": "[email protected]"
}
]
}