---
title: "CVE-2026-52727: LXC-ci Arch Linux - Authentication Bypass"
description: "LXC-ci Arch Linux images built before 2026-05-28 contain a privilege escalation caused by redistribution of pacman local-signing private key in /etc/pacman.d/gnupg, letting attackers controlling HTTP mirrors execute arbitrary code as root, exploit requires attacker to control or intercept mirror traffic."
url: https://panop.io/threat-heartbeat/CVE-2026-52727/
---

# CVE-2026-52727 LXC-ci Arch Linux - Authentication Bypass

LXC-ci Arch Linux images built before 2026-05-28 contain a privilege escalation caused by redistribution of pacman local-signing private key in /etc/pacman.d/gnupg, letting attackers controlling HTTP mirrors execute arbitrary code as root, exploit requires attacker to control or intercept mirror traffic.

CVSS base score 7.2 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.59% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-52727)

## Details

Type

Authentication Bypass

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-321](https://cwe.mitre.org/data/definitions/321.html)

## Vendor fix

Update to Arch Linux images published on or after 2026-05-28.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-52727](https://nvd.nist.gov/vuln/detail/CVE-2026-52727)
- [https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp](https://github.com/lxc/lxc-ci/security/advisories/GHSA-4h59-f67g-5qxp)
- [https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a](https://github.com/lxc/lxc-ci/commit/082cb34ea19791a0424feafd9da67b94881ea40a)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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