{"cve":"CVE-2026-34388","nvd":{"published":"2026-03-27T20:16:35.800","modified":"2026-10-26T00:10:00.150","status":"Analyzed","description":"Fleet is open source device management software. Prior to 4.81.0, a denial-of-service vulnerability in Fleet's gRPC Launcher endpoint allows an authenticated host to crash the entire Fleet server process by sending an unexpected log type value. The server terminates immediately, disrupting all connected hosts, MDM enrollments, and API consumers. Version 4.81.0 patches the issue.","cvss_v4":{"vector":"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:U","score":6.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-703"],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-w254-4hp5-7cvv"],"products":["fleetdm:fleet"],"source":"nvd","synced_at":"2026-10-26T00:31:35.753532240+00:00"},"epss":{"cve":"CVE-2026-34388","score":0.00273,"percentile":0.19514,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-w254-4hp5-7cvv","url":"https://osv.dev/vulnerability/GHSA-w254-4hp5-7cvv","summary":"Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint","modified":"2026-04-02T21:26:25.290885842Z","packages":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","ranges":["<4.81.0"],"fixed":["4.81.0"]}]},{"id":"GO-2026-4915","url":"https://osv.dev/vulnerability/GO-2026-4915","summary":"Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint in github.com/fleetdm/fleet","modified":"2026-04-02T21:20:10.480831Z","packages":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","ranges":["<4.81.0"],"fixed":["4.81.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}