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CVE-2026-33542— Incus does not verify combined fingerprint when downloading images from simplestreams servers

Quick assessment

Affected
lxc incus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 6.23.0之前版本存在信任管理问题漏洞，该漏洞源于从simplestreams镜像服务器下载时缺少镜像指纹验证，可能导致镜像缓存投毒。

AI Predicted 8.2 Difficulty: Moderate EPSS 0.20% · P9
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I. Basic Information for CVE-2026-33542

Vulnerability Information
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Vulnerability Title
Incus does not verify combined fingerprint when downloading images from simplestreams servers
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 6.23.0之前版本存在信任管理问题漏洞，该漏洞源于从simplestreams镜像服务器下载时缺少镜像指纹验证，可能导致镜像缓存投毒。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 6.23.0 -

II. Public POCs for CVE-2026-33542

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III. Intelligence Information for CVE-2026-33542

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Vendor Advisories for CVE-2026-33542 (1)

Same Patch Batch · lxc · 2026-03-26 · 6 CVEs total

CVE-2026-33897 10.0 CRITICAL Incus vulnerable to arbitrary file read and write through pongo templates
CVE-2026-33945 10.0 CRITICAL Abitrary file write through systemd-creds option
CVE-2026-33898 8.8 HIGH Local Incus UI web server vulnerable to nuthentication bypass
CVE-2026-33743 6.5 MEDIUM Incus vulnerable to denial of source through crafted bucket backup file
CVE-2026-33711 Incus vulnerable to local privilege escalation through VM screenshot path

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-295

V. Comments for CVE-2026-33542

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