GHSA-x5r6-jr56-89pv · Severity: medium · Ecosystem: go — Incus has Nil Dereferences on Restore via Malformed YAML
Incus is a system container and virtual machine manager. Prior to version 7.0.0, backup.GetInfo() trusts the inline backup/index.yaml config when present and only falls back to parsing the legacy backup/container/backup.yaml file if result.Config == nil. As a result, an archive can carry a valid inline config that passes the initial import preflight while also carrying a malformed legacy backup/container/backup.yaml file that is reparsed later from the restored file system. ParseConfigYamlFile() accepts YAML documents with no container section, and multiple downstream consumers then dereference. Container without checking for nil. Confirmed examples in the instance restore and import flow include backup.UpdateInstanceConfig() and internalImportFromBackup(). An authenticated user with permission to import instance backups may be able to crash the Incus daemon with a crafted backup archive whose inline backup/index.yaml is valid but whose extracted legacy backup.yaml omits container. The crash occurs in the restore path after archive extraction has begun. This issue has been patched in version 7.0.0.
Conclusion & alert: CVE-2026-41684 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-22 | 0.06% | 0.02% | -0.04% |
| 2 | 2026-05-08 | — | 0.06% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
GHSA-x5r6-jr56-89pv · Severity: medium · Ecosystem: go — Incus has Nil Dereferences on Restore via Malformed YAML
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-41684 not yet assigned priority: Debian including 2 source packages (incus, lxd), 5 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-41684 |
ubuntu
|
medium | CVE-2026-41684 medium priority: Ubuntu including 2 source packages (incus, lxd), 13 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, upstream, xenial): needs-triage 8, DNE 5. | https://ubuntu.com/security/CVE-2026-41684 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| linuxcontainers | incus | < 7.0.0 | cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://github.com/lxc/incus/releases/tag/v7.0.0 | Patch Product |
| https://github.com/lxc/incus/security/advisories/GHSA-x5r6-jr56-89pv | Exploit Mitigation Vendor Advisory |