High
Security advisory
An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the "skippy peanut butter" issue.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3121
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:57 UTC · Revision 1
Source evidence
An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the "skippy peanut butter" issue.
osv:CVE-2021-3121
Complete source record
{
"id": "a44c5ed6298510fb6a1e629bb615857aefe5c817722502c71489de0a231714c6",
"url": "https://osv.dev/vulnerability/CVE-2021-3121",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3121",
"summary": "An issue was discovered in GoGo Protobuf before 1.3.2. plugin/unmarshal/unmarshal.go lacks certain index validation, aka the \"skippy peanut butter\" issue.",
"evidence": "osv:CVE-2021-3121",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3121",
"aliases": [
"BIT-consul-2021-3121",
"BIT-protobuf-2021-3121",
"CVE-2021-3121",
"GHSA-c3h9-896r-86jm",
"GO-2021-0053"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gogo/protobuf",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "b03c65ea87cdc3521ede29f62fe3ce239267c1bc"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:golang:protobuf:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.3.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "b03c65ea87cdc3521ede29f62fe3ce239267c1bc"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v1.0.0",
"v0.5",
"v0.4",
"v0.3",
"v0.2",
"v0.1"
],
"database_specific": {
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}
},
{
"ranges": [
{
"repo": "https://github.com/hashicorp/consul",
"type": "GIT",
"events": [
{
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},
{
"fixed": "a4f67ec2bffec430e6677dc5a449e89b9b56aa13"
},
{
"introduced": "a417fe51040a33039d3282e31c6c6b6f4fd1f886"
},
{
"fixed": "b0906b5bb0b6df6149aa1645d331030f5e85be30"
},
{
"introduced": "27de64da7095570012e9f8f7aec16aaf66d2a773"
},
{
"fixed": "3cb6eeedbda90aad6b387b89917971086d6cf6b5"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.8.15"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.8.15"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "1.9.0"
},
{
"fixed": "1.9.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "1.9.0"
},
{
"fixed": "1.9.9"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "1.10.0"
},
{
"fixed": "1.10.2"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:consul:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "1.10.0"
},
{
"fixed": "1.10.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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"v1.9.8",
"v1.8.14",
"v1.10.1-beta1",
"api/v1.9.1",
"v1.8.13",
"v1.9.7",
"v1.10.0-rc2",
"v1.10.0-rc",
"v1.10.0-beta4",
"v1.9.6",
"v1.8.12",
"v1.8.11-beta2",
"v1.10.0-beta2",
"v1.10.0-beta1",
"v1.9.5",
"v1.8.10",
"v1.9.4",
"v1.8.9",
"v1.8.9-beta1",
"v1.9.2",
"v1.9.1",
"api/v1.8.1",
"v1.8.7",
"v1.8.7-beta1",
"v1.8.4",
"api/v1.7.0",
"v1.8.3",
"sdk/v0.6.0",
"v1.8.0-beta2",
"v1.8.0-beta1",
"v1.7.0",
"sdk/v0.4.0",
"api/v1.4.0",
"v1.7.0-beta3",
"v1.7.0-beta2",
"v1.7.0-beta1",
"v1.6.1",
"v1.6.0",
"api/v1.2.0",
"sdk/v0.2.0",
"v1.5.3",
"v1.5.2",
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"api/v1.1.0",
"sdk/v0.1.1",
"api/v1.0.1",
"sdk/v0.1.0",
"api/v1.0.0",
"internal/v0.1.0",
"v1.4.3",
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"v1.4.1",
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"v1.1.0",
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"v0.9.3",
"v1.4.0",
"v1.4.0-rc1",
"v1.2.2",
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"v1.2.0",
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"v1.0.0",
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"v1.0.0-beta1",
"v0.9.3-rc2",
"v0.9.3-rc1",
"v0.9.2",
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"v0.9.0-rc1",
"v0.8.5",
"v0.8.4",
"v0.8.2",
"v0.8.1",
"v0.8.0",
"v0.8.0-rc1",
"v0.7.4",
"v0.7.3",
"v0.7.2",
"v0.7.2-rc1",
"v0.7.1",
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"v0.6.4",
"v0.6.4-rc3",
"v0.6.3",
"v0.6.1",
"v0.6.0",
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"v0.5.1",
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"v0.4.1",
"v0.4.0",
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"v0.3.0",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3121.json"
}
}
],
"modified": "2026-10-24T10:51:24.925534389Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/r68032132c0399c29d6cdc7bd44918535da54060a10a12b1591328bff%40%3Cnotifications.skywalking.apache.org%3E",
"https://lists.apache.org/thread.html/r88d69555cb74a129a7bf84838073b61259b4a3830190e05a3b87994e%40%3Ccommits.pulsar.apache.org%3E",
"https://lists.apache.org/thread.html/rc1e9ff22c5641d73701ba56362fb867d40ed287cca000b131dcf4a44%40%3Ccommits.pulsar.apache.org%3E",
"https://discuss.hashicorp.com/t/hcsec-2021-23-consul-exposed-to-denial-of-service-in-gogo-protobuf-dependency/29025",
"https://security.netapp.com/advisory/ntap-20210219-0006/",
"https://github.com/gogo/protobuf/commit/b03c65ea87cdc3521ede29f62fe3ce239267c1bc",
"https://github.com/gogo/protobuf/compare/v1.3.1...v1.3.2"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-3121",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442602,
"published_at": "2021-01-11T06:15:13.46+00:00"
}