---
title: "CVE-2026-48750: Incus has an arbitrary file write on host via `exec-output` symlink in crafted image"
url: https://erroneo.us/security/cve/CVE-2026-48750/
description: "CVE-2026-48750 (github.com/lxc/incus/v7/cmd/incusd (Go)): Incus is a system container and virtual machine manager. Prior to version 7.2.0, the record-output…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-21
date_modified: 2026-08-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-48750"
kev: false
cvss: 9.9
epss: 0.00731
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 54: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 54% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/lxc/incus/v7/cmd/incusd (Go) < 7.2.0, fixed in 7.2.0 . Check your lockfile, including transitive dependencies.

## What it is

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 execUUID.stdout and execUUID.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 packages

- Go `github.com/lxc/incus/v7/cmd/incusd` < 7.2.0 → fixed: 7.2.0

## Affected products (CVE record)

- lxc incus: < 7.2.0

## Severity

- GitHub_M CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.9 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.73% probability of exploitation activity in the next 30 days; percentile 54.

## Sources

- [GitHub Advisory GHSA-73hr-m85f-64v9](https://github.com/advisories/GHSA-73hr-m85f-64v9)
- [CVE.org record CVE-2026-48750](https://www.cve.org/CVERecord?id=CVE-2026-48750)
- [NVD entry CVE-2026-48750](https://nvd.nist.gov/vuln/detail/CVE-2026-48750)
- [github.com](https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9)

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Source page: https://erroneo.us/security/cve/CVE-2026-48750/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt