by Kastro
Paper/Archive/CVE-2026-48750

CVE-2026-48750

lxc incus — Incus has an arbitrary file write on host via `exec-output` symlink in crafted image

EPSS 0.7%CVSS 9.9
critical.is priorityof 100
41
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 54.3.543 × 2010.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
incus< 7.2.0–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

exploitgithub.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9