Critical [CVE-2026-48750] Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
This critical-severity Red Hat Linux advisory covers CVE-2026-48750.
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Summary
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. A crafted container image can cause the host to write files to arbitrary locations via a symlink, potentially leading to command execution as root on the host.
Incus is not shipped in any Red Hat product. The community Fedora package is affected.
Red Hat severity: Critical — CVSS 9.9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H). Weakness: CWE-61.
- < 7.2.0
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- No mitigation is needed as Incus is not shipped in any Red Hat product.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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