Critical Security Update for Skopeo: Addressing Multiple Denial of Service Vulnerabilities
Summary
ALSA-2026:64818: Important: skopeo security update. Affects skopeo versions < 2:1.22.2-5.el10_2. Fixed in 2:1.22.2-5.el10_2. How to fix ↓
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Background
Skopeo is a command-line utility that facilitates the inspection of container images from various registries, retrieval of images and their layers, and the creation and verification of signatures for files. It is widely used in containerized environments for managing images efficiently. However, recent vulnerabilities have been identified that could potentially compromise its functionality and security.
Vulnerability Detail
The vulnerabilities in Skopeo stem from several components of the Go programming language, which it relies on. These include denial of service (DoS) vulnerabilities caused by pathological email address parsing, excessive recursion in ASN.1 unmarshalling, quadratic complexity in URL path resolution, unencrypted HTTP/2 connections, cross-site scripting from pathological HTML input, and indefinite KeyUpdate messages in TLS. These vulnerabilities can lead to service interruptions, data exposure, and exploitation by malicious actors.
How To Fix
Minimum fixed version
2:1.22.2-5.el10_2
This is the first release that contains the fix.
sudo dnf update skopeoTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, you can limit the exposure of Skopeo by restricting access to the service or using it in a controlled environment until the update is applied. Additionally, consider using alternative methods for image management that do not rely on the vulnerable components.
Conclusion
In summary, the recent vulnerabilities identified in Skopeo pose significant risks that can lead to denial of service and potential exploitation. It is crucial to update to the latest patched version to mitigate these risks effectively. Users are encouraged to monitor their applications for vulnerabilities using tools like Vulert for real-time alerts.
See every vulnerability recorded for skopeo →
FAQ
Skopeo is a command-line tool that allows users to manage container images, including inspecting, copying, and signing images from various registries.
The vulnerabilities include denial of service attacks due to email parsing, excessive recursion, URL path resolution issues, unencrypted HTTP/2 connections, cross-site scripting, and TLS message handling.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by these vulnerabilities without needing to sign up.
If an immediate update is not possible, consider implementing access restrictions and using alternative image management methods until the vulnerabilities are resolved.
For detailed information about the vulnerabilities, refer to the CVE pages linked in the security advisory or consult the official documentation of Skopeo.
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