{"id":"CVE-2026-87799","revision":null,"records":[{"revision":"cf0dca321b9546de8de7cc3cfb2c5425","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-87799","aliases":[],"title":"Arbitrary file write on LXD host via symlink in migration stream","description":"Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client that can create instances or custom storage volumes in a project, or a malicious migration source server, to write attacker-controlled files to arbitrary paths on the target host as root, leading to full host compromise. The attacker does this with a crafted rsync or btrfs send stream that plants a symlink in the transferred volume, such as rootfs or root.img, and then writes through it.","state":0,"publishedAt":"2026-09-28T13:22:29.148+00:00","modifiedAt":"2026-09-29T03:55:19.115+00:00","affected":[{"ecosystem":"Vendor product","name":"LXD","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Canonical\",\n                    \"product\": \"LXD\",\n                    \"platforms\": [\n                        \"Linux\"\n                    ],\n                    \"packageName\": \"LXD\",\n                    \"repo\": \"https://github.com/canonical/lxd\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"4.0.0\",\n                            \"lessThan\": \"4.0.14\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"5.0.0\",\n                            \"lessThan\": \"5.0.10\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"5.21.0\",\n                            \"lessThan\": \"5.21.8\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"6.0\",\n                            \"lessThan\": \"6.10\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":"CRITICAL"}],"references":["https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-87799","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-87799","identifiers":["CVE-2026-87799"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EPSS backfill.","generation":"2026-11-12T07:54:58.2349119+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T07:54:58.2349119+00:00","lastSuccessAt":"2026-11-12T07:54:58.4862124+00:00","error":null,"lastVerifiedAt":"2026-11-12T07:54:58.4862143+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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