CVE-2026-34165: go-git: Maliciously crafted idx file can cause asymmetric memory consumption
Impact
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.
Patches
Users should upgrade to v5.17.1, or the latest v6 pseudo-version, in order to mitigate this vulnerability.
Credit
The go-git maintainers thank @kq5y for finding and reporting this issue privately to the go-git project.
Other sources
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.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
go/github.com/go-git/go-git/v5to a version that resolves this vulnerability.Fixed in 5.17.1 - Upgrade
Upgrade
go-gitto a version that resolves this vulnerability.Fixed in v5.17.1