{"answers":{"affected":"5 open source packages ship an affected version, including github.com/lxc/incus/v7/cmd/incusd, github.com/lxc/incus and github.com/lxc/incus/v6.","exploited":"There is no known exploitation of CVE-2026-48756 in the wild and no public exploit code.","fix":"Upgrade github.com/lxc/incus/v7/cmd/incusd to 7.1.0 or later.","what":"CVE-2026-48756 is a low-severity vulnerability in lxc incus, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-48756 and fix it if it is affected.\n\nWhat it is: CVE-2026-48756 is a low-severity vulnerability in lxc incus, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-48756 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/lxc/incus/v7/cmd/incusd (Go): affected all versions; fixed in 7.1.0\n- github.com/lxc/incus/v7/cmd/incusd (Go): affected all versions; fixed in 7.1.0\n- github.com/lxc/incus (Go): affected all versions; no fix listed\n- github.com/lxc/incus/v6 (Go): affected all versions; no fix listed\n- github.com/lxc/incus/v7 (Go): affected all versions; fixed in 7.1.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-48756/ (Markdown: https://insights.sbomify.com/CVE-2026-48756/index.md)","id":"CVE-2026-48756","markdown":"https://insights.sbomify.com/CVE-2026-48756/index.md","name":"CVE-2026-48756","record":{"aliases":["DEBIAN-CVE-2026-48756","GHSA-xhqx-mgh3-3h7q","GO-2026-5810","UBUNTU-CVE-2026-48756"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Incus container manager","requires_auth":"low_privilege","summary":"An authenticated user can crash the Incus daemon by uploading a backup tarball with missing snapshot expiration fields, causing a null pointer dereference.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":2.1,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"Incus is a system container and virtual machine manager. Prior to version 7.1.0, `(*backend).CreateCustomVolumeFromBackup` in `internal/server/storage/backend.go` contains an unguarded `*time.Time` dereference on the `ExpiresAt` field of every volume-snapshot entry in an imported custom-volume backup. An authenticated user with `can_create_storage_volumes` permission on any project can crash the `incusd` daemon by uploading a backup tarball whose `volume_snapshots[*].expires_at` field is absent. This is a sibling-field variant of GHSA-r7w7-mmxr-47r9 (CVE-2026-40197). Commit `985a1dedf9f3e7ba729c93b654905ed510de25c2` added `if s == nil` at the top of the loop body, but did not guard the adjacent `*snapshot.ExpiresAt` deref 19 lines later. Every other consumer of `Config.VolumeSnapshots[i].ExpiresAt` in this same file already gates the deref with a nil-check — the asymmetric guard is the bug. Version 7.1.0 contains an updated patch.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Incus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires_at (sibling-field variant of GHSA-r7w7)","id":"CVE-2026-48756","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":5,"n_references":1,"next":{"headline":"sigstore-js: DSSE payloadType type-binding failure","id":"CVE-2026-48758"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus","purl":"pkg:golang/github.com/lxc/incus","source":"GO-2026-5810"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v6","purl":"pkg:golang/github.com/lxc/incus/v6","source":"GO-2026-5810"},{"ecosystem":"Go","fixed":["7.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v7","purl":"pkg:golang/github.com/lxc/incus/v7","source":"GO-2026-5810"},{"ecosystem":"Go","fixed":["7.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v7/cmd/incusd","purl":null,"source":"GHSA-xhqx-mgh3-3h7q"},{"ecosystem":"Go","fixed":["7.1.0"],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v7/cmd/incusd","purl":"pkg:golang/github.com/lxc/incus/v7/cmd/incusd","source":"GHSA-xhqx-mgh3-3h7q"}],"prev":{"headline":"Incus has an argument injection in backup compression algorithm leading to AFW and ACE","id":"CVE-2026-48755"},"products":["incus"],"published":"2026-08-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-21","vendors":["lxc"]},"summary":"An authenticated user can crash the Incus daemon by uploading a backup tarball with missing snapshot expiration fields, causing a null pointer dereference.","url":"https://insights.sbomify.com/CVE-2026-48756/"}