CVE Catalog

CVE-2026-52727

HighCVSS 7.2
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.59%

46th percentile - higher than 46% of all known CVEs

Summary

In lxc-ci, images built from images/archlinux.yaml prior to the 2026-05-28 Arch Linux image publication 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. The issue is fixed in Arch Linux images published on or after 2026-05-28.

Risk Assessment

An attacker can deliver malicious packages signed with the shared key that are accepted as trusted, leading to arbitrary code execution as root on the client system. This affects all containers and virtual machines created from vulnerable images.

Recommendation

Update Arch Linux images to those published on or after 2026-05-28 and recreate containers and virtual machines from the new images. Avoid using images that contain the shared pacman signing key.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS