CVE-2026-33762
go-git: Missing validation decoding Index v4 files leads to panic
go-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.
Fixes and workarounds
Fix
github.com/go-git/go-git/v5 (Go): OSV reports a fixed version 5.17.1. Check the advisory for supported release branches.
Source: OSV GHSA-gm2x-2g9h-ccm8Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| go-git go-git |
< 5.17.1 (affected) | CNA: GitHub_M |
github.com/go-git/go-git/v5github.com/go-git/go-git/v5
Go |
≥ 0; < 5.17.1 (affected, semver); OSV events: introduced 0; fixed 5.17.1Source events (semver)Other versions: unaffected |
OSV GHSA-gm2x-2g9h-ccm8 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
NVD applicability configurations (1)
These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.
[
{
"negate": false,
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:go-git_project:go-git:*:*:*:*:*:go:*:*",
"versionEndExcluding": "5.17.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
]CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 2.8 low |
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L | CNA: GitHub_M |
| 3.1 / 2.8 low |
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/go-git/go-git/commit/e9b65df44cb97faeba148b47523a362beaecddf9CNA: GitHub_M · x_refsource_MISC
- https://github.com/go-git/go-git/releases/tag/v5.17.1CNA: GitHub_M · x_refsource_MISC
- https://github.com/go-git/go-git/commit/e9b65df44cb97faeba148b47523a362beaecddf9[email protected]
- https://github.com/go-git/go-git/releases/tag/v5.17.1[email protected] · Product, Release Notes
- https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8[email protected] · Vendor Advisory
- https://github.com/advisories/GHSA-gm2x-2g9h-ccm8OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-gm2x-2g9h-ccm8OSV / GitHub Security Advisories · osv
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