CVE-2026-23991: Client DoS Vulnerability in go-tuf Package
Summary
CVE-2026-23991: go-tuf affected by client DoS via malformed server response in github.com/theupdateframework/go-tuf. Affected versions are not published. No fix is published. How to fix ↓
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Background
The go-tuf package, developed by the Update Framework, is a Go implementation of the TUF (The Update Framework) specification. It is designed to provide secure updates for software packages, ensuring that users can trust the integrity and authenticity of the updates they receive. The package facilitates secure distribution of software by managing metadata and signatures, making it a critical component for applications relying on secure update mechanisms. However, it is susceptible to a denial-of-service (DoS) attack when it encounters malformed server responses.
Vulnerability Detail
The vulnerability identified as CVE-2026-23991 in the go-tuf package allows for a client-side denial-of-service (DoS) attack. This occurs when the client receives a malformed response from the server, which can lead to unexpected behavior or crashes. The issue arises from improper handling of server responses, making it possible for an attacker to exploit this flaw by sending crafted responses that the client cannot process correctly. The ramifications of this vulnerability can include service interruptions and degraded performance for applications utilizing the go-tuf package, potentially affecting user experience and system reliability.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, you can implement input validation on the client side to handle unexpected server responses more gracefully. This may involve checking the structure and content of the responses before processing them, thereby mitigating the risk of a DoS attack.
Conclusion
In summary, CVE-2026-23991 is a significant vulnerability in the go-tuf package that can lead to client-side denial-of-service attacks due to malformed server responses. It is crucial for users of this package to update to version 2.3.1 or later to mitigate the risk. Additionally, implementing workarounds can help manage the vulnerability until a full update can be performed.
See every vulnerability recorded for github.com/theupdateframework/go-tuf →
FAQ
CVE-2026-23991 is a vulnerability in the go-tuf package that allows for client-side denial-of-service attacks via malformed server responses.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which allows you to monitor for open-source vulnerabilities without requiring any signup.
The vulnerability can lead to service interruptions and degraded performance, affecting the reliability of applications that depend on the go-tuf package.
Yes, a patch is available in version 2.3.1 of the go-tuf package. It is recommended to update to this version to mitigate the vulnerability.
If an immediate update is not possible, consider implementing input validation on the client side to handle unexpected server responses more effectively.
Related vulnerabilities
Recent vulnerabilities recorded for github.com/theupdateframework/go-tuf.
