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CVE-2026-33945— Abitrary file write through systemd-creds option

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之前版本存在路径遍历漏洞，该漏洞源于攻击者可设置特制配置键导致Incus写入容器关联的credentials目录之外，可能导致权限提升和拒绝服务攻击。

CVSS 10.0 · Critical EPSS 0.53% · P43
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I. Basic Information for CVE-2026-33945

Vulnerability Information
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Vulnerability Title
Abitrary file write through systemd-creds option
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Incus instances have an option to provide credentials to systemd in the guest. For containers, this is handled through a shared directory. Prior to version 6.23.0, an attacker can set a configuration key named something like `systemd.credential.../../../../../../root/.bashrc` to cause Incus to write outside of the `credentials` directory associated with the container. This makes use of the fact that the Incus syntax for such credentials is `systemd.credential.XYZ` where `XYZ` can itself contain more periods. While it's not possible to read any data this way, it's possible to write to arbitrary files as root, enabling both privilege escalation and denial of service attacks. 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:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 路径遍历漏洞
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之前版本存在路径遍历漏洞，该漏洞源于攻击者可设置特制配置键导致Incus写入容器关联的credentials目录之外，可能导致权限提升和拒绝服务攻击。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 6.23.0 -

II. Public POCs for CVE-2026-33945

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III. Intelligence Information for CVE-2026-33945

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Vendor Advisories for CVE-2026-33945 (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-2026-33898 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
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-22

V. Comments for CVE-2026-33945

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