CVE-2026-34165

CVE-2026-34165 is a medium-severity vulnerability in Go-git Project Go-git with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Description

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.

Frequently asked questions

What is CVE-2026-34165?
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.
How severe is CVE-2026-34165?
CVE-2026-34165 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34165 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34165?
CVE-2026-34165 affects Go-git Project Go-git. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34165?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34165 have an EU (EUVD) identifier?
Yes. CVE-2026-34165 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17449.
When was CVE-2026-34165 published?
CVE-2026-34165 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

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