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Fencer Vulns
medium 4.8

CVE-2026-33542 json

Incus does not verify combined fingerprint when downloading images from simplestreams servers

published 2026-03-26 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-16460 , GHSA-p8mm-23gg-jc9r , GO-2026-4882

cvss
4.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

Incus is a system container and virtual machine manager. Prior to version 6.23.0, a lack of validation of the image fingerprint when downloading from simplestreams image servers opens the door to image cache poisoning and under very narrow circumstances exposes other tenants to running attacker controlled images rather than the expected one. Version 6.23.0 patches the issue.

Patch / fix

  • go github.com/lxc/incus/v6/client 6.23.0
  • go github.com/lxc/incus/v6 6.23.0
  • linuxcontainers incus 6.23.0
  • lxd Debian 13 5.0.2+git20231211.1364ae4-9+deb13u4
  • incus Debian 13 6.0.4-2+deb13u5
  • incus Debian 14 6.0.6-2

debian advisories DEBIAN-CVE-2026-33542

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • incus openSUSE Tumbleweed 6.23-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:10450-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33542 updated cvss 8.5

github.com/lxc/incus: Incus: Image cache poisoning due to insufficient image fingerprint validation

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 5.7 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:P
CNA 4.0 5.7 CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/lxc/incus/v6/client
<6.23.0
6.23.0
go github.com/lxc/incus
all versions
 no fix listed
go github.com/lxc/incus/v6
<6.23.0
6.23.0

Affected products

  • lxc incus

Classification

Weakness
  • CWE-295 Improper Certificate Validation
  • CWE-354 Improper Validation of Integrity Check Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.