GHSA-83xr-5xxr-mh92 · Severity: critical · Ecosystem: go — Incus vulnerable to arbitrary file read and write through pongo templates
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.
Conclusion & alert: CVE-2026-33897 is rated Moderate Risk (41.5/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.02%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-21 | 0.06% | 0.02% | -0.04% |
| 2 | 2026-04-01 | 0.05% | 0.06% | +0.01% |
| 3 | 2026-03-27 | — | 0.05% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.9 | 3.1 | CRITICAL |
|
3.1 | 6.0 | [email protected] |
GHSA-83xr-5xxr-mh92 · Severity: critical · Ecosystem: go — Incus vulnerable to arbitrary file read and write through pongo templates
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-33897: 1 source package rows (incus); 31 state rows across 2 repos (3.23-community, edge-community); fixed 0, open 31. | https://security.alpinelinux.org/vuln/CVE-2026-33897 |
debian
|
not yet assigned | CVE-2026-33897 not yet assigned priority: Debian including 2 source packages (incus, lxd), 5 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2026-33897 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-33897 |
suse
|
high | CVE-2026-33897 severity important: SUSE including 5 source package names (incus-6.23-1.1, incus-bash-completion-6.23-1.1, incus-fish-completion-6.23-1.1, incus-tools-6.23-1.1, incus-zsh-completion-6.23-1.1), 5 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 5. | https://www.suse.com/security/cve/CVE-2026-33897/ |
ubuntu
|
medium | CVE-2026-33897 medium priority: Ubuntu including 2 source packages (incus, lxd), 11 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): needs-triage 5, DNE 4, not-affected 1, released 1. | https://ubuntu.com/security/CVE-2026-33897 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| linuxcontainers | incus | < 6.23.0 | cpe:2.3:a:linuxcontainers:incus:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://github.com/lxc/incus/security/advisories/GHSA-83xr-5xxr-mh92 | Vendor Advisory |