Vulnerability · Published Sep 17, 2026 · Assigned by GitHub_M
CVE-2026-52727lxc-ci: Pacman keyring stored in archlinux image with a private key
High 7.2
In plain English
A high-severity security flaw in lxc-ci from lxc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
lxc-ci contains continuous integration and image-build scripts for LXC. Prior to the 2026-05-28 Arch Linux image publication, images built from images/archlinux.yaml retain the same pacman local-signing private key in /etc/pacman.d/gnupg and redistribute it to every container or virtual machine created from that image. An attacker who controls an HTTP package mirror or can intercept mirror traffic can use the shared pacman signing private key to sign modified packages that affected clients accept as trusted. Installing those packages permits arbitrary code execution as root on the client system. This issue is fixed in Arch Linux images published on or after 2026-05-28.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | lxc-ci | no fix listed | DEBIAN-CVE-2026-52727 |
| Debian:14 | lxc-ci | 0.0~git20260914.1b378a7-1 | DEBIAN-CVE-2026-52727 |
| Ubuntu:24.04:LTS | lxc-ci | no fix listed | UBUNTU-CVE-2026-52727 |
| Ubuntu:26.04:LTS | lxc-ci | no fix listed | UBUNTU-CVE-2026-52727 |
| Ubuntu:26.10 | lxc-ci | no fix listed | UBUNTU-CVE-2026-52727 |
Affected products (as reported)
Weakness: CWE-321 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp x_refsource_CONFIRM
- https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a x_refsource_MISC