{"id":"GO-2026-5301","revision":null,"records":[{"revision":"bb5edaae0e96465d9e17bf530489c1df","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-26191","aliases":[],"title":"Fleet vulnerable to OS command injection in software packages","description":"Fleet is open source device management software. Prior to version 4.81.0, a vulnerability in Fleet's software installer pipeline could allow a crafted software package to execute arbitrary commands as root (macOS/Linux) or SYSTEM (Windows) on managed endpoints when an uninstall is triggered. When a software package (.pkg, .deb, .rpm, .exe, or .msi) is uploaded to Fleet, metadata is extracted from the package binary and used to generate uninstall scripts. In affected versions, this metadata is not properly sanitized before being included in the generated scripts. A specially crafted package containing malicious values in its metadata fields could result in unintended command execution when the uninstall script runs on managed endpoints. Version 4.81.0 contains a patch. If an immediate upgrade is not possible, administrators should avoid uploading software packages obtained from untrusted or unverified sources. Additionally, administrators can manually inspect and edit auto-generated uninstall scripts before deployment.","state":0,"publishedAt":"2026-05-14T19:02:12.383+00:00","modifiedAt":"2026-05-15T14:15:18.44+00:00","affected":[{"ecosystem":"Vendor product","name":"fleet","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fleetdm\",\n                    \"product\": \"fleet\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.81.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":6,"severity":"MEDIUM"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-9vcr-g537-3w5v","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-26191","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-26191","identifiers":["CVE-2026-26191"]},"retained":false,"historicalAffected":[]},{"revision":"6f9d7133f9754f32b9be3fb22744a300","observedAt":"2026-10-28T02:53:43.031+00:00","statement":{"source":"euvd","id":"EUVD-2026-30376","aliases":["CVE-2026-26191","GHSA-9vcr-g537-3w5v"],"title":"Fleet is open source device management software. 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If an immediate upgrade is not possible, administrators should avoid uploading software packages obtained from untrusted or unverified sources. 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Prior to version 4.81.0, a vulnerability in Fleet's software installer pipeline could allow a crafted software package to execute arbitrary commands as root (macOS/Linux) or SYSTEM (Windows) on managed endpoints when an uninstall is triggered. When a software package (.pkg, .deb, .rpm, .exe, or .msi) is uploaded to Fleet, metadata is extracted from the package binary and used to generate uninstall scripts. In affected versions, this metadata is not properly sanitized before being included in the generated scripts. A specially crafted package containing malicious values in its metadata fields could result in unintended command execution when the uninstall script runs on managed endpoints. Version 4.81.0 contains a patch. If an immediate upgrade is not possible, administrators should avoid uploading software packages obtained from untrusted or unverified sources. Additionally, administrators can manually inspect and edit auto-generated uninstall scripts before deployment.","state":0,"publishedAt":"2026-05-14T20:17:02.173+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:P/PR:N/UI:P/VC:N/VI:H/VA:N/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":6,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.1","https://github.com/fleetdm/fleet/security/advisories/GHSA-9vcr-g537-3w5v"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-26191","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-78"],"productCriteria":["cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-14T20:17:02.173","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-2026-26191","identifiers":["CVE-2026-26191"]},"retained":false,"historicalAffected":[]},{"revision":"4f19f44479bc46c4a0e5b66a02cff7cc","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-9vcr-g537-3w5v","aliases":["CVE-2026-26191","GO-2026-5301"],"title":"Fleet vulnerable to OS command injection in software packages","description":"### Summary\n\nA vulnerability in Fleet's software installer pipeline could allow a crafted software package to execute arbitrary commands as root (macOS/Linux) or SYSTEM (Windows) on managed endpoints when an uninstall is triggered.\n\n### Impact\n\nWhen a software package (.pkg, .deb, .rpm, .exe, or .msi) is uploaded to Fleet, metadata is extracted from the package binary and used to generate uninstall scripts. In affected versions, this metadata is not properly sanitized before being included in the generated scripts. A specially crafted package containing malicious values in its metadata fields could result in unintended command execution when the uninstall script runs on managed endpoints.\n\n### Workarounds\n\nIf an immediate upgrade is not possible, administrators should avoid uploading software packages obtained from untrusted or unverified sources. Additionally, administrators can manually inspect and edit auto-generated uninstall scripts before deployment.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\nEmail us at [[security@fleetdm.com](mailto:security@fleetdm.com)](mailto:security@fleetdm.com)\n\nJoin #fleet in [[osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)\n\n### Credits\n\nWe thank @secfox-ai for responsibly reporting this issue.","state":0,"publishedAt":"2026-05-14T13:17:36+00:00","modifiedAt":"2026-06-25T19:56:32.6094693+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-9vcr-g537-3w5v","https://nvd.nist.gov/vuln/detail/CVE-2026-26191","https://github.com/fleetdm/fleet","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.1"],"sourceUrl":"https://github.com/advisories/GHSA-9vcr-g537-3w5v","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-9vcr-g537-3w5v","identifiers":["GHSA-9vcr-g537-3w5v","CVE-2026-26191","GO-2026-5301"]},"retained":false,"historicalAffected":[]},{"revision":"6ff884cfbcb343aab4c704d79acc5a2d","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5301","aliases":["CVE-2026-26191","GHSA-9vcr-g537-3w5v"],"title":"Fleet vulnerable to OS command injection in software packages in github.com/fleetdm/fleet","description":"Fleet vulnerable to OS command injection in software packages in github.com/fleetdm/fleet","state":0,"publishedAt":"2026-06-25T18:43:19+00:00","modifiedAt":"2026-06-25T19:45:27.5545196+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-9vcr-g537-3w5v","https://nvd.nist.gov/vuln/detail/CVE-2026-26191","https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.1"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5301","license":"OSV · upstream source license applies","key":"osv:GO-2026-5301","identifiers":["GO-2026-5301","CVE-2026-26191","GHSA-9vcr-g537-3w5v"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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