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vuln-cve/data/2026/56xxx/CVE-2026-56864.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-56864",
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"state": "PUBLISHED",
"assignerShortName": "Go",
"dateReserved": "2026-06-23T15:10:49.354Z",
"datePublished": "2026-08-13T21:58:53.605Z",
"dateUpdated": "2026-08-14T16:16:42.248Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go",
"dateUpdated": "2026-08-13T21:58:53.605Z"
},
"title": "Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb",
"descriptions": [
{
"lang": "en",
"value": "A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content that cannot be detected by evaluating the transparency log. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy"
}
],
"affected": [
{
"vendor": "Go toolchain",
"product": "cmd/go",
"collectionURL": "https://pkg.go.dev",
"packageName": "cmd/go",
"versions": [
{
"version": "0",
"lessThan": "1.25.13",
"status": "affected",
"versionType": "semver"
},
{
"version": "1.26.0-0",
"lessThan": "1.26.6",
"status": "affected",
"versionType": "semver"
},
{
"version": "1.27.0-0",
"lessThan": "1.27.0-rc.3",
"status": "affected",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "golang.org/x/mod",
"product": "golang.org/x/mod/sumdb",
"collectionURL": "https://pkg.go.dev",
"packageName": "golang.org/x/mod/sumdb",
"versions": [
{
"version": "0",
"lessThan": "0.40.0",
"status": "affected",
"versionType": "semver"
}
],
"programRoutines": [
{
"name": "Client.Lookup"
}
],
"defaultStatus": "unaffected"
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-347: Improper Verification of Cryptographic Signature"
}
]
}
],
"references": [
{
"url": "https://go.dev/issue/80745"
},
{
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"url": "https://go.dev/cl/815000"
},
{
"url": "https://go.dev/cl/815020"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-6180"
}
],
"credits": [
{
"lang": "en",
"value": "mundur"
}
]
},
"adp": [
{
"problemTypes": [
{
"descriptions": [
{
"type": "CWE",
"cweId": "CWE-347",
"lang": "en",
"description": "CWE-347 Improper Verification of Cryptographic Signature"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-08-14T16:16:37.911009Z",
"id": "CVE-2026-56864",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-08-14T16:16:42.248Z"
}
}
]
}
}