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TI-2026-26122 Aliases CVE-2026-33743GHSA-vg76-xmhg-j5x3

Incus vulnerable to denial of source through crafted bucket backup file

Priority MEDIUM 62CWE-770Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Incus is a system container and virtual machine manager. Prior to version 6.23.0, a specially crafted storage bucket backup can be used by an user with access to Incus' storage bucket feature to crash the Incus daemon. Repeated use of this attack can be used to keep the server offline causing a denial of service of the control plane API. This does not impact any running workload, existing containers and virtual machines will keep operating. Version 6.23.0 fixes the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00392 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed incus (lxc): 6.23.0github.com/lxc/incus/v6 (Go): 6.23.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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 6.23.06.23.0Patch availableCNA
—github.com/lxc/incus/v6 (Go)before 6.23.06.23.0Patch availableGHSA-vg76-xmhg-j5x3
—github.com/lxc/incus (Go)up to 0.7.0—No fix listedGHSA-vg76-xmhg-j5x3
  • incus Vendorlxc Affected before 6.23.0 Fixed in 6.23.0 Patch available CNA
  • github.com/lxc/incus/v6 (Go) Vendor— Affected before 6.23.0 Fixed in 6.23.0 Patch available GHSA-vg76-xmhg-j5x3
  • github.com/lxc/incus (Go) Vendor— Affected up to 0.7.0 Fixed in — No fix listed GHSA-vg76-xmhg-j5x3

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:*before 6.23.0Vulnerablelxc
  • cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:* Versions before 6.23.0 Vulnerable ·lxc

Remediation

  • Fix · CNA incus (lxc) Fixed in 6.23.0
  • Fix · GHSA-vg76-xmhg-j5x3 github.com/lxc/incus/v6 (Go) Fixed in 6.23.0 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-2026-33743
  2. 2026-10-03 Alias added: GHSA-vg76-xmhg-j5x3

References

Exploit 1

Advisory 1

Other 3

  • TI-2026-19296 Incus container image templating arbitrary host file read and write CVSS 3.1HIGH 8.7
  • TI-2026-19295 Incus container environment configuration newline injection CVSS 3.1HIGH 8.7
  • TI-2025-39899 Incus vulnerable to local privilege escalation through custom storage volumes CVSS 4.0HIGH 8.6
  • TI-2026-29045 Incus out-of-bounds panic in snapshot metadata handling allows denial of service CVSS 4.0HIGH 7.1
  • TI-2026-29009 Incus nil-pointer dereference in storage bucket import allows denial of service CVSS 4.0HIGH 7.1
  • TI-2026-25935 Incus does not verify combined fingerprint when downloading images from simplestreams servers CVSS 4.0MEDIUM 5.7
See all 17 →

Sources

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