Critical Security Flaw in Image-Builder Package: IPv6 Host Literal Parsing Issue

image-builder Updated 06 May 2026

Summary

05/05/2026

Disclosed on

N/A

Severity

Yes i

Fix available

Unrated

Severity

Not published

CVSS Score

ALSA-2026:13642: Important: image-builder security update. Affects image-builder versions < 31-5.el10_1. Fixed in 31-5.el10_1. How to fix ↓

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Background

The image-builder package is a local binary tool designed for creating customized operating system artifacts, such as virtual machine images and OSTree commits. It operates using osbuild as its underlying framework, providing users with a streamlined method for building and managing OS images. However, this package has been found to have a significant security vulnerability related to the parsing of IPv6 host literals, which could potentially expose systems to various security threats.

Vulnerability Detail

The vulnerability identified as CVE-2026-25679 arises from incorrect parsing of IPv6 host literals in the net/url module. This flaw can lead to improper handling of network requests, allowing attackers to exploit the vulnerability to manipulate network traffic or gain unauthorized access to sensitive information. The ramifications of this vulnerability can be severe, potentially compromising the integrity and confidentiality of the affected systems.

How To Fix

Minimum fixed version

31-5.el10_1

This is the first release that contains the fix.

sudo dnf update image-builder

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Workaround

As a temporary workaround, users can avoid using the affected functionality related to IPv6 host literals until the package is updated. This may involve configuring applications to use IPv4 addresses instead, thereby mitigating the risk associated with this vulnerability.

Conclusion

In summary, the image-builder package has a critical vulnerability related to the parsing of IPv6 host literals, which can lead to significant security risks. Users are advised to update to the patched version promptly and consider workarounds until the update can be applied. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.

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