go-git: Missing validation decoding Index v4 files leads to panic

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-33762
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-31 15:16:15 UTC
Updated2026-04-01 14:24:02 UTC
Descriptiongo-git is an extensible git implementation library written in pure Go. Prior to version 5.17.1, go-git’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing. This issue only affects Git index format version 4. Earlier formats (go-git supports only v2 and v3) are not vulnerable to this issue. This issue has been patched in version 5.17.1.

Risk And Classification

Primary CVSS: v3.1 2.8 LOW from [email protected]

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

EPSS: 0.000130000 probability, percentile 0.020870000 (date 2026-04-01)

Problem Types: CWE-129 | CWE-129 CWE-129: Improper Validation of Array Index

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary2.8LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
3.1CNADECLARED2.8LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go-git Go-git affected < 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-gm2x-2g9h-ccm8 [email protected] github.com
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