go-git up to 5.17.0 integer underflow

Summaryinfo

A vulnerability described as problematic has been identified in go-git up to 5.17.0. Affected is an unknown function. The manipulation results in integer underflow. This vulnerability was named CVE-2026-34165. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in go-git up to 5.17.0. It has been classified as problematic. Affected is an unknown code block. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on availability. CVE summarizes:

go-git is an extensible git implementation library written in pure Go. From version 5.0.0 to before version 5.17.1, a vulnerability has been identified in which a maliciously crafted .idx file can cause asymmetric memory consumption, potentially exhausting available memory and resulting in a denial-of-service (DoS) condition. Exploitation requires write access to the local repository's .git directory, it order to create or alter existing .idx files. This issue has been patched in version 5.17.1.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34165 since 03/25/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 311385 (Fedora 44 : jfrog-cli (2026-6b87863841)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.17.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (311385). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Versioning Software

Name

• go-git

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.16
• 5.17.0

Website

• Product: https://github.com/go-git/go-git/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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