CVE-2026-33897Network attack vector

Host file read and write via broken chroot

Published Mar 26, 2026 · Updated Mar 26, 2026

Template injection in Linux Containers Incus before 6.23.0 allows remote authenticated users to read or write host files as root. The LXC and QEMU instance template paths render pongo2 templates through a ChrootLoader whose isolation is never enforced, exposing file functions to host paths. Access requires privileges to supply an instance template; exploitation crosses the instance boundary and compromises host confidentiality and integrity.

CVSS severity9.9
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Template injection in Linux Containers Incus before 6.23.0 allows remote authenticated users to read or write host files as root. The LXC and QEMU instance template paths render pongo2 templates through a ChrootLoader whose isolation is never enforced, exposing file functions to host paths. Access requires privileges to supply an instance template; exploitation crosses the instance boundary and compromises host confidentiality and integrity.

The record

CVE
CVE-2026-33897
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Linux Containers
Product
Incus
Classifications
CWE-1336, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.23.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linux Containers · Incusversion=< 6.23.0

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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