Vulnerability · Published May 7, 2026 · Assigned by GitHub_M
CVE-2026-41648Incus: Unbounded YAML Metadata Decode via Parsing
Medium 5.3
In plain English
A medium-severity resource allocation without limits in incus from lxc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | incus | 7.0.0-r0 | ALPINE-CVE-2026-41648 |
| Debian:13 | incus | 6.0.4-2+deb13u7 | DEBIAN-CVE-2026-41648 |
| Debian:14 | incus | 7.0.0-1 | DEBIAN-CVE-2026-41648 |
| Debian:12 | lxd | no fix listed | DEBIAN-CVE-2026-41648 |
| Debian:13 | lxd | 5.0.2+git20231211.1364ae4-9+deb13u6 | DEBIAN-CVE-2026-41648 |
| Go | github.com/lxc/incus | no fix listed | GO-2026-5168 |
| Go | github.com/lxc/incus/v6 | no fix listed | GO-2026-5168 |
| Go | github.com/lxc/incus/v6/cmd/incusd | no fix listed | GHSA-67wx-r9xr-x75x |
| Ubuntu:25.10 | incus | no fix listed | UBUNTU-CVE-2026-41648 |
| Ubuntu:26.10 | incus | no fix listed | UBUNTU-CVE-2026-41648 |
Affected products (as reported)
Weakness: CWE-770 · 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
References
- https://github.com/lxc/incus/security/advisories/GHSA-67wx-r9xr-x75x x_refsource_CONFIRM
- https://github.com/lxc/incus/releases/tag/v7.0.0 x_refsource_MISC