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CVE-2026-33743— Incus vulnerable to denial of source through crafted bucket backup file

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之前版本存在安全漏洞，该漏洞源于特制存储桶备份可被利用，可能导致拒绝服务。

CVSS 6.5 · Medium EPSS 0.44% · P37
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I. Basic Information for CVE-2026-33743

Vulnerability Information
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Vulnerability Title
Incus vulnerable to denial of source through crafted bucket backup file
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 安全漏洞
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之前版本存在安全漏洞，该漏洞源于特制存储桶备份可被利用，可能导致拒绝服务。
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-2026-33743

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III. Intelligence Information for CVE-2026-33743

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Vendor Advisories for CVE-2026-33743 (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-2026-33711 Incus vulnerable to local privilege escalation through VM screenshot path
CVE-2026-33542 Incus does not verify combined fingerprint when downloading images from simplestreams serv

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-770

V. Comments for CVE-2026-33743

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