go-git: Maliciously crafted idx file can cause asymmetric memory consumption

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-34165
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 15:16:17 UTC
Updated2026-04-01 14:24:02 UTC
Descriptiongo-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.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.000130000 probability, percentile 0.020220000 (date 2026-04-01)

Problem Types: CWE-191 | CWE-770 | CWE-191 CWE-191: Integer Underflow (Wrap or Wraparound) | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go-git Go-git affected >= 5.0.0, < 5.17.1 Not specified

References

ReferenceSourceLinkTags
github.com/go-git/go-git/releases/tag/v5.17.1 [email protected] github.com
github.com/go-git/go-git/security/advisories/GHSA-jhf3-xxhw-2wpp [email protected] github.com
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