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TI-2026-36021 Aliases CVE-2026-48750GHSA-73hr-m85f-64v9

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

Priority MEDIUM 44CWE-73Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00784 56th percentileScored 2026-11-07
Fix Fixed incus (lxc): 7.2.0lxd (canonical): 4.0.11, 5.0.7, 5.21.5 +1+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
lxcincusbefore 7.2.07.2.0Patch availableCNA
Canonicallxd4.0.0 to before 4.0.11; 5.0.0 to before 5.0.7; 5.1.0 to before 5.21.5; 6.0.0 to before 6.9.04.0.11, 5.0.7, 5.21.5, 6.9.0Patch availableCNA
—github.com/lxc/incus/v7/cmd/incusd (Go)before 7.2.07.2.0Patch availableGHSA-73hr-m85f-64v9
  • incus Vendorlxc Affected before 7.2.0 Fixed in 7.2.0 Patch available CNA
  • lxd VendorCanonical Affected 4.0.0 to before 4.0.11; 5.0.0 to before 5.0.7; 5.1.0 to before 5.21.5; 6.0.0 to before 6.9.0 Fixed in 4.0.11, 5.0.7, 5.21.5, 6.9.0 Patch available CNA
  • github.com/lxc/incus/v7/cmd/incusd (Go) Vendor— Affected before 7.2.0 Fixed in 7.2.0 Patch available GHSA-73hr-m85f-64v9

CPE names Threatist (inferred) · 2

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*——lxc
cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*——Canonical
  • cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:* Versions — — ·lxc
  • cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* Versions — — ·Canonical

Remediation

  • Fix · CNA incus (lxc) Fixed in 7.2.0
  • Fix · CNA lxd (canonical) Fixed in 4.0.11, 5.0.7, 5.21.5, 6.9.0
  • Fix · GHSA-73hr-m85f-64v9 github.com/lxc/incus/v7/cmd/incusd (Go) Fixed in 7.2.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48750
  2. 2026-10-03 Alias added: GHSA-73hr-m85f-64v9
  3. 2026-11-05 1 new reference · CNA
  4. 2026-11-05 2 new references · GHSA-73hr-m85f-64v9
  5. 2026-11-06 Affected versions changed · CNA

References

Advisory 1

Other 3

  • TI-2019-04061 runc through 1.0-rc6, as used in Docker before 18.09.2 and other products, allows… CVSS 3.1HIGH 8.6
  • TI-2026-45063 Incus vulnerable to root RCE via image backup.yaml symlink CVSS 3.1CRITICAL 9.9
  • TI-2026-44978 Incus: Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge CVSS 3.1CRITICAL 9.9
  • TI-2026-36039 Incus has an arbitrary file write on its client due to trusted image hash CVSS 3.1CRITICAL 9.9
  • TI-2026-36024 Incus has an arbitrary file write via path traversal in S3 multipart upload CVSS 3.1CRITICAL 9.9
  • TI-2026-36022 Incus has a restricted project bypass leading to arbitrary command execution CVSS 3.1CRITICAL 9.9
See all 63 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences