# CVE-2026-48750: Incus has an arbitrary file write on host via `exec-output` symlink in crafted image

Status: published. Published: 2026-08-21. Updated: 2026-11-05.

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.

## Remediation

- fix: github.com/lxc/incus/v7/cmd/incusd (Go): OSV reports a fixed version 7.2.0. Check the advisory for supported release branches. (source: OSV GHSA-73hr-m85f-64v9) — https://github.com/advisories/GHSA-73hr-m85f-64v9

## Affected products and versions

- lxc / incus: < 7.2.0 (affected). Source: CNA: GitHub_M
- canonical / lxd: >= 4.0.0, < 4.0.11 (affected); >= 5.0.0, < 5.0.7 (affected); >= 5.1.0, < 5.21.5 (affected); >= 6.0.0, < 6.9.0 (affected). Source: CNA: GitHub_M
-  / github.com/lxc/incus/v7/cmd/incusd (github.com/lxc/incus/v7/cmd/incusd): ≥ 0; < 7.2.0 (affected, semver); OSV events: introduced 0; fixed 7.2.0. Source: OSV GHSA-73hr-m85f-64v9

## Severity and prioritization

- CVSS 3.1: 9.9 (critical); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.73% as of 2026-11-05; percentile 54.44%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-73

## Exploit evidence

- exploit: https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9 (ADP: CISA-ADP)

## References

- https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/canonical/lxd/security/advisories/GHSA-9j25-mm2h-2f76 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9 (ADP: CISA-ADP; exploit)

- https://github.com/advisories/GHSA-73hr-m85f-64v9 (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-73hr-m85f-64v9 (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-48750; retrieved 2026-11-06; source updated 2026-11-05

- OSV / GitHub Security Advisories (partial: 1/2 referenced advisories verified): https://osv.dev/vulnerability/GHSA-73hr-m85f-64v9; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-48750; retrieved 2026-11-05; source updated Not reported

Revision: eaab4e3c4ca4290d18143fa5614f0295acf2dc952782b0941642a8c9d80a6831

Canonical: https://y2.dev/cve/CVE-2026-48750

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