---
id: CVE-2026-105768
title: >-
  apko allows users to build and publish OCI container images built from apk
  packages
summary: >-
  apko allows users to build and publish OCI container images built from apk
  packages. From version 0.2.0 to before version 1.4.5, UserEntry.Parse and
  GroupEntry.Parse in pkg/passwd read the UID and GID fields of /etc/passwd and
  /etc/group…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N'
cwe:
  - CWE-197
vendor: chainguard-dev
product: chainguard.dev/apko
affected:
  - chainguard.dev/apko >= 0.2.0 < 1.4.5
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T21:16:36.027'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105768'
references:
  - url: >-
      https://github.com/chainguard-dev/apko/commit/739e7ce3f675ffb232e16849b51ff93657f1570c
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
  - url: 'https://github.com/chainguard-dev/apko/pull/2516'
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
  - url: 'https://github.com/chainguard-dev/apko/releases/tag/v1.4.5'
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
  - url: >-
      https://github.com/chainguard-dev/apko/security/advisories/GHSA-rj6x-hwpv-vhvf
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-05T21:34:25.115Z'
---

## Overview

apko allows users to build and publish OCI container images built from apk packages. From version 0.2.0 to before version 1.4.5, UserEntry.Parse and GroupEntry.Parse in pkg/passwd read the UID and GID fields of /etc/passwd and /etc/group entries with strconv.Atoi and convert them to uint32 without a range check. On 64-bit platforms an out-of-range value such as 4294967296 (2^32) is truncated to 0, and negative values wrap. Because apko parses the passwd and group entries supplied by the packages it installs and writes them back into the image, an attacker who controls a package installed into the image can ship an entry that appears to declare an unprivileged UID or GID but is written into the built image as UID 0 or GID 0 (root). The truncated UID is also used when resolving the image's run-as user. This issue has been fixed in version 1.4.5.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.