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CVE-2026-33897— Incus vulnerable to arbitrary file read and write through pongo templates

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，该漏洞源于实例模板文件中的pongo2模板绕过chroot隔离机制，可能导致任意读写。

CVSS 10.0 · Critical EPSS 0.53% · P43
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I. Basic Information for CVE-2026-33897

Vulnerability Information
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Vulnerability Title
Incus vulnerable to arbitrary file read and write through pongo templates
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Prior to version 6.23.0, instance template files can be used to cause arbitrary read or writes as root on the host server. Incus allows for pongo2 templates within instances which can be used at various times in the instance lifecycle to template files inside of the instance. This particular implementation of pongo2 within Incus allowed for file read/write but with the expectation that the pongo2 chroot feature would isolate all such access to the instance's filesystem. This was allowed such that a template could theoretically read a file and then generate a new version of said file. Unfortunately the chroot isolation mechanism is entirely skipped by pongo2 leading to easy access to the entire system's filesystem with root privileges. Version 6.23.0 patches 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
CWE-1336
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，该漏洞源于实例模板文件中的pongo2模板绕过chroot隔离机制，可能导致任意读写。
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-2026-33897

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III. Intelligence Information for CVE-2026-33897

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Vendor Advisories for CVE-2026-33897 (1)

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

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
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-1336

V. Comments for CVE-2026-33897

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