{"id":"CVE-2026-26062","revision":null,"records":[{"revision":"f861580581564a21b01675047e7bb9ad","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-26062","aliases":[],"title":"Fleet server may terminate unexpectedly when handling certain gRPC requests","description":"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.","state":0,"publishedAt":"2026-05-14T19:00:21.559+00:00","modifiedAt":"2026-05-14T19:43:46.038+00:00","affected":[{"ecosystem":"Vendor product","name":"fleet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fleetdm\",\n                    \"product\": \"fleet\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.81.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-26062","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-26062","identifiers":["CVE-2026-26062"]},"retained":false,"historicalAffected":[]},{"revision":"979a5d284fe840609f91fff9a0c7ad44","observedAt":"2026-10-28T02:53:29.024+00:00","statement":{"source":"euvd","id":"EUVD-2026-30375","aliases":["CVE-2026-26062","GHSA-x67p-9m2r-fxqv"],"title":"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 gr…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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","score":8.7,"severity":null}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30375","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 14, 2026, 7:00:21 PM","dateUpdated":"May 14, 2026, 7:43:46 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-30375","identifiers":["EUVD-2026-30375","CVE-2026-26062","GHSA-x67p-9m2r-fxqv"]},"retained":false,"historicalAffected":[]},{"revision":"ff54628abe004dfba69ab0250dd148e1","observedAt":"2026-10-27T07:23:21.229+00:00","statement":{"source":"nvd","id":"CVE-2026-26062","aliases":[],"title":"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 gr…","description":"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.","state":0,"publishedAt":"2026-05-14T20:17:02.02+00:00","modifiedAt":"2026-10-26T14:10:00.13+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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: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","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0","https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-26062","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-20","NVD-CWE-noinfo"],"productCriteria":["cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-14T20:17:02.020","lastModified":"2026-10-26T14:10:00.130"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-26062","identifiers":["CVE-2026-26062"]},"retained":false,"historicalAffected":[]},{"revision":"abb46b5bf75048c7bbfbcaf0330ca541","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-x67p-9m2r-fxqv","aliases":["CVE-2026-26062","GO-2026-5744"],"title":"Fleet server may terminate unexpectedly when handling certain gRPC requests","description":"### Summary\n\nFleet 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.\n\n### Impact\n\nAn 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.\n\nThis vulnerability impacts **availability only**. There is:\n\n- No exposure of sensitive data\n- No authentication bypass\n- No privilege escalation\n- No integrity impact\n\n### Workarounds\n\nIf upgrading immediately is not possible, the following mitigations can reduce exposure:\n\n- Restrict network access to the Fleet gRPC endpoint where feasible (for example, limiting inbound access to known host IP ranges).\n- Deploy Fleet behind infrastructure that terminates or filters gRPC traffic if Launcher log ingestion is not required.\n- Monitor for repeated Fleet process crashes or unexpected restarts indicating potential exploitation.\n\n### For More Information\n\nIf you have any questions or concerns about this advisory, please contact us at:\n\nEmail us at [security@fleetdm.com](mailto:security@fleetdm.com)\n\n### Credits\n\nWe thank @fuzzztf for responsibly reporting this issue.","state":0,"publishedAt":"2026-05-14T13:17:18+00:00","modifiedAt":"2026-06-25T23:11:19.1358103+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv","https://nvd.nist.gov/vuln/detail/CVE-2026-26062","https://github.com/fleetdm/fleet","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0"],"sourceUrl":"https://github.com/advisories/GHSA-x67p-9m2r-fxqv","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-x67p-9m2r-fxqv","identifiers":["GHSA-x67p-9m2r-fxqv","CVE-2026-26062","GO-2026-5744"]},"retained":false,"historicalAffected":[]},{"revision":"a6f6be9515a04411bfa708dc4468c8c4","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5744","aliases":["CVE-2026-26062","GHSA-x67p-9m2r-fxqv"],"title":"Fleet server may terminate unexpectedly when handling certain gRPC requests in github.com/fleetdm/fleet","description":"Fleet server may terminate unexpectedly when handling certain gRPC requests in github.com/fleetdm/fleet","state":0,"publishedAt":"2026-06-25T22:34:38+00:00","modifiedAt":"2026-06-25T23:01:41.2188176+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-x67p-9m2r-fxqv","https://nvd.nist.gov/vuln/detail/CVE-2026-26062","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5744","license":"OSV · upstream source license applies","key":"osv:GO-2026-5744","identifiers":["GO-2026-5744","CVE-2026-26062","GHSA-x67p-9m2r-fxqv"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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