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4 vulnerabilities by golang.org/x/mod
CVE-2026-56865 (GCVE-0-2026-56865)
Vulnerability from nvd – Published: 2026-08-13 21:58 – Updated: 2026-08-13 21:58
VLAI
EPSS
VEX
Title
Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog
Summary
A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy
Severity
No CVSS data available.
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.13
(semver)
Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver) |
|
| golang.org/x/mod | golang.org/x/mod/sumdb/tlog |
Affected:
0 , < 0.40.0
(semver)
|
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.13",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.6",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
},
{
"lessThan": "1.27.0-rc.3",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/mod/sumdb/tlog",
"product": "golang.org/x/mod/sumdb/tlog",
"programRoutines": [
{
"name": "tileHashReader.ReadHashes"
}
],
"vendor": "golang.org/x/mod",
"versions": [
{
"lessThan": "0.40.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Filippo Valsorda (Geomys)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ \u0026\u0026 go mod tidy"
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-13T21:58:53.475Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/80744"
},
{
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"url": "https://go.dev/cl/814960"
},
{
"url": "https://go.dev/cl/815020"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-6179"
}
],
"title": "Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56865",
"datePublished": "2026-08-13T21:58:53.475Z",
"dateReserved": "2026-06-23T15:10:49.354Z",
"dateUpdated": "2026-08-13T21:58:53.475Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-56864 (GCVE-0-2026-56864)
Vulnerability from nvd – Published: 2026-08-13 21:58 – Updated: 2026-08-13 21:58
VLAI
EPSS
VEX
Title
Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb
Summary
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
Severity
No CVSS data available.
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.13
(semver)
Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver) |
|
| golang.org/x/mod | golang.org/x/mod/sumdb |
Affected:
0 , < 0.40.0
(semver)
|
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.13",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.6",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
},
{
"lessThan": "1.27.0-rc.3",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/mod/sumdb",
"product": "golang.org/x/mod/sumdb",
"programRoutines": [
{
"name": "Client.Lookup"
}
],
"vendor": "golang.org/x/mod",
"versions": [
{
"lessThan": "0.40.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "mundur"
}
],
"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/ \u0026\u0026 go mod tidy"
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-13T21:58:53.605Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"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"
}
],
"title": "Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56864",
"datePublished": "2026-08-13T21:58:53.605Z",
"dateReserved": "2026-06-23T15:10:49.354Z",
"dateUpdated": "2026-08-13T21:58:53.605Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-56864 (GCVE-0-2026-56864)
Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-13 21:58
VLAI
EPSS
VEX
Title
Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb
Summary
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
Severity
No CVSS data available.
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.13
(semver)
Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver) |
|
| golang.org/x/mod | golang.org/x/mod/sumdb |
Affected:
0 , < 0.40.0
(semver)
|
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.13",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.6",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
},
{
"lessThan": "1.27.0-rc.3",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/mod/sumdb",
"product": "golang.org/x/mod/sumdb",
"programRoutines": [
{
"name": "Client.Lookup"
}
],
"vendor": "golang.org/x/mod",
"versions": [
{
"lessThan": "0.40.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "mundur"
}
],
"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/ \u0026\u0026 go mod tidy"
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-13T21:58:53.605Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"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"
}
],
"title": "Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56864",
"datePublished": "2026-08-13T21:58:53.605Z",
"dateReserved": "2026-06-23T15:10:49.354Z",
"dateUpdated": "2026-08-13T21:58:53.605Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-56865 (GCVE-0-2026-56865)
Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-13 21:58
VLAI
EPSS
VEX
Title
Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog
Summary
A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy
Severity
No CVSS data available.
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.13
(semver)
Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver) |
|
| golang.org/x/mod | golang.org/x/mod/sumdb/tlog |
Affected:
0 , < 0.40.0
(semver)
|
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.13",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.6",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
},
{
"lessThan": "1.27.0-rc.3",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/mod/sumdb/tlog",
"product": "golang.org/x/mod/sumdb/tlog",
"programRoutines": [
{
"name": "tileHashReader.ReadHashes"
}
],
"vendor": "golang.org/x/mod",
"versions": [
{
"lessThan": "0.40.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Filippo Valsorda (Geomys)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be detected by evaluating the transparency log. All tiles are now correctly verified against their parents. In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ \u0026\u0026 go mod tidy"
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-13T21:58:53.475Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/80744"
},
{
"url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
},
{
"url": "https://go.dev/cl/814960"
},
{
"url": "https://go.dev/cl/815020"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-6179"
}
],
"title": "Fix transparency log tile verification bypass in golang.org/x/mod/sumdb/tlog"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56865",
"datePublished": "2026-08-13T21:58:53.475Z",
"dateReserved": "2026-06-23T15:10:49.354Z",
"dateUpdated": "2026-08-13T21:58:53.475Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}