{"id":"CVE-2026-26062","sourceIdentifier":"security-advisories@github.com","published":"2026-05-14T20:17:02.020","lastModified":"2026-10-26T14:10:00.130","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Fleet is open source device management software. Prior to version 4.81.0, Fleet contained a denial-of-service (DoS) issue in the gRPC Launcher `PublishLogs` endpoint. In affected versions, certain unexpected input values were not handled gracefully, which could cause the Fleet server process to terminate while processing an authenticated request from an enrolled Launcher host. An authenticated attacker with access to any enrolled Launcher node key could cause an immediate and complete denial of service by sending a single gRPC request to the `PublishLogs` endpoint. This vulnerability impacts availability only. There is no exposure of sensitive data, no authentication bypass, no privilege escalation, and no integrity impact. Version 4.81.0 contains a patch. If upgrading immediately is not possible, the following mitigations can reduce exposure.  Restrict network access to the Fleet gRPC endpoint where feasible (for example, limiting inbound access to known host IP ranges); deploy Fleet behind infrastructure that terminates or filters gRPC traffic if Launcher log ingestion is not required; and/or monitor for repeated Fleet process crashes or unexpected restarts indicating potential exploitation."},{"lang":"es","value":"Fleet es un software de gestión de dispositivos de código abierto. Antes de la versión 4.81.0, Fleet contenía un problema de denegación de servicio (DoS) en el endpoint ’PublishLogs’ del Launcher gRPC. En las versiones afectadas, ciertos valores de entrada inesperados no se manejaron correctamente, lo que podría causar que el proceso del servidor de Fleet terminara mientras procesaba una solicitud autenticada de un host Launcher registrado. Un atacante autenticado con acceso a cualquier clave de nodo de Launcher registrado podría causar una denegación de servicio inmediata y completa al enviar una única solicitud gRPC al endpoint ’PublishLogs’. Esta vulnerabilidad impacta solo la disponibilidad. No hay exposición de datos sensibles, no hay omisión de autenticación, no hay escalada de privilegios y no hay impacto en la integridad. La versión 4.81.0 contiene un parche. Si la actualización inmediata no es posible, las siguientes mitigaciones pueden reducir la exposición. Restringir el acceso a la red al endpoint gRPC de Fleet donde sea factible (por ejemplo, limitando el acceso entrante a rangos de IP de hosts conocidos); desplegar Fleet detrás de una infraestructura que termine o filtre el tráfico gRPC si la ingesta de registros de Launcher no es necesaria; y/o monitorear si hay fallos repetidos del proceso de Fleet o reinicios inesperados que indiquen una posible explotación."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"fleetdm","product":"fleet","versions":[{"version":"< 4.81.0","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","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:H/SC:N/SI:N/SA:N/E:X/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":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","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":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-14T19:43:39.182559Z","id":"CVE-2026-26062","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-20"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*","versionEndExcluding":"4.81.0","matchCriteriaId":"84AB2C74-C556-4B42-9A54-A5B201D1BDC3"}]}]}],"references":[{"url":"https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}