lxc lxc-ci Image Build images/archlinux.yaml hard-coded credentials

Summaryinfo

A vulnerability described as very critical has been identified in lxc lxc-ci. Affected by this issue is some unknown functionality of the file images/archlinux.yaml of the component Image Build. Executing a manipulation can lead to hard-coded credentials. This vulnerability is handled as CVE-2026-52727. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in lxc lxc-ci (unknown version). It has been declared as very critical. This vulnerability affects an unknown code block of the file images/archlinux.yaml of the component Image Build. The manipulation with an unknown input leads to a hard-coded credentials vulnerability. The CWE definition for the vulnerability is CWE-798. The product contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-52727 since 06/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/17/2026). This vulnerability is assigned to T1110.001 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• lxc

Name

• lxc-ci

Website

• Product: https://github.com/lxc/lxc-ci/

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