# CVE-2026-48755: Incus has an argument injection in backup compression algorithm leading to AFW and ACE

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

Incus is a system container and virtual machine manager. Prior to version 7.1.0, improper validation of user-provided backup compression algorithm leads to argument injection in the constructed command line. This leads to an arbitrary file write on the host, possibly leading to arbitrary command execution. Version 7.1.0 patches the issue.

## 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-v6mj-8pf4-hhw4) — https://github.com/advisories/GHSA-v6mj-8pf4-hhw4

## 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-v6mj-8pf4-hhw4

## 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-20

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/lxc/incus/security/advisories/GHSA-v6mj-8pf4-hhw4 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/canonical/lxd/security/advisories/GHSA-fmc8-p6q7-75cc (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/advisories/GHSA-v6mj-8pf4-hhw4 (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-v6mj-8pf4-hhw4 (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-48755; retrieved 2026-11-06; source updated 2026-11-05

- OSV / GitHub Security Advisories (partial: 1/2 referenced advisories verified): https://osv.dev/vulnerability/GHSA-v6mj-8pf4-hhw4; retrieved 2026-11-06; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-48755; retrieved 2026-11-06; source updated Not reported

Revision: c82f3b91657b9ad40f376105689f87f2eadab8a381019435ea0f389cd4c41fa8

Canonical: https://y2.dev/cve/CVE-2026-48755

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