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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33762
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 13:13 UTC · Revision 1
Source evidence
go-git: Missing validation decoding Index v4 files leads to panic
core-osv · Original sourcePublished 31 Mar 2026, 13:47 UTC
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.
osv:CVE-2026-33762
Complete source record
{
"id": "02f1121f8e38c82e15471f98e6e2879ad87fda054420e05f1ca5529381fb3b05",
"url": "https://osv.dev/vulnerability/CVE-2026-33762",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "go-git: Missing validation decoding Index v4 files leads to panic",
"summary": "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.",
"evidence": "osv:CVE-2026-33762",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-33762",
"aliases": [
"CVE-2026-33762",
"GHSA-gm2x-2g9h-ccm8",
"GO-2026-4909"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/go-git/go-git",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5e23dfd02db92644dc4a3358ceb297fce875b772"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
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{
"fixed": "5.17.1"
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "5e23dfd02db92644dc4a3358ceb297fce875b772"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v5.17.1"
},
{
"cpe": "cpe:2.3:a:go-git_project:go-git:*:*:*:*:*:go:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "5.17.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
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"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33762.json"
}
}
],
"modified": "2026-10-28T02:30:28.978631583Z",
"provider": "osv",
"references": [
"https://github.com/go-git/go-git/releases/tag/v5.17.1",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33762.json",
"https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-33762"
],
"provider_metadata": {
"cwe_ids": [
"CWE-129"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33762.json"
}
},
"related_cves": [
{
"value": "CVE-2026-33762",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495725,
"published_at": "2026-03-31T13:47:42.378+00:00"
}