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2 vulnerabilities found for internal/syscall/windows by Go standard library
CVE-2026-56857 (GCVE-0-2026-56857)
Vulnerability from nvd – Published: 2026-10-08 22:53 – Updated: 2026-10-08 22:53
VLAI
EPSS
VEX
Title
Root.Mkdir(All) can follow junctions out of the root on Windows in os
Summary
On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target).
Severity
No CVSS data available.
CWE
- CWE-1386 - Insecure Operation on Windows Junction / Mount Point
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | os |
Affected:
0 , < 1.26.9
(semver)
Affected: 1.27.0-0 , < 1.27.2 (semver) |
|
| Go standard library | internal/syscall/windows |
Affected:
0 , < 1.26.9
(semver)
Affected: 1.27.0-0 , < 1.27.2 (semver) |
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "os",
"platforms": [
"windows"
],
"product": "os",
"programRoutines": [
{
"name": "Root.Mkdir"
},
{
"name": "doInRoot"
},
{
"name": "rootMkdirAll"
},
{
"name": "Root.Chmod"
},
{
"name": "Root.Chown"
},
{
"name": "Root.Chtimes"
},
{
"name": "Root.Lchown"
},
{
"name": "Root.Link"
},
{
"name": "Root.MkdirAll"
},
{
"name": "Root.Remove"
},
{
"name": "Root.RemoveAll"
},
{
"name": "Root.Rename"
},
{
"name": "Root.Symlink"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.26.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.27.2",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "internal/syscall/windows",
"platforms": [
"windows"
],
"product": "internal/syscall/windows",
"programRoutines": [
{
"name": "Mkdirat"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.26.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.27.2",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Daniele Ballarini"
}
],
"descriptions": [
{
"lang": "en",
"value": "On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target)."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-1386: Insecure Operation on Windows Junction / Mount Point",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-08T22:53:58.387Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/847305"
},
{
"url": "https://go.dev/issue/81739"
},
{
"url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-6604"
}
],
"title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56857",
"datePublished": "2026-10-08T22:53:58.387Z",
"dateReserved": "2026-06-23T15:10:49.353Z",
"dateUpdated": "2026-10-08T22:53:58.387Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-56857 (GCVE-0-2026-56857)
Vulnerability from cvelistv5 – Published: 2026-10-08 22:53 – Updated: 2026-10-08 22:53
VLAI
EPSS
VEX
Title
Root.Mkdir(All) can follow junctions out of the root on Windows in os
Summary
On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target).
Severity
No CVSS data available.
CWE
- CWE-1386 - Insecure Operation on Windows Junction / Mount Point
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | os |
Affected:
0 , < 1.26.9
(semver)
Affected: 1.27.0-0 , < 1.27.2 (semver) |
|
| Go standard library | internal/syscall/windows |
Affected:
0 , < 1.26.9
(semver)
Affected: 1.27.0-0 , < 1.27.2 (semver) |
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "os",
"platforms": [
"windows"
],
"product": "os",
"programRoutines": [
{
"name": "Root.Mkdir"
},
{
"name": "doInRoot"
},
{
"name": "rootMkdirAll"
},
{
"name": "Root.Chmod"
},
{
"name": "Root.Chown"
},
{
"name": "Root.Chtimes"
},
{
"name": "Root.Lchown"
},
{
"name": "Root.Link"
},
{
"name": "Root.MkdirAll"
},
{
"name": "Root.Remove"
},
{
"name": "Root.RemoveAll"
},
{
"name": "Root.Rename"
},
{
"name": "Root.Symlink"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.26.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.27.2",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "internal/syscall/windows",
"platforms": [
"windows"
],
"product": "internal/syscall/windows",
"programRoutines": [
{
"name": "Mkdirat"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.26.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.27.2",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Daniele Ballarini"
}
],
"descriptions": [
{
"lang": "en",
"value": "On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target)."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-1386: Insecure Operation on Windows Junction / Mount Point",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-08T22:53:58.387Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/847305"
},
{
"url": "https://go.dev/issue/81739"
},
{
"url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-6604"
}
],
"title": "Root.Mkdir(All) can follow junctions out of the root on Windows in os"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-56857",
"datePublished": "2026-10-08T22:53:58.387Z",
"dateReserved": "2026-06-23T15:10:49.353Z",
"dateUpdated": "2026-10-08T22:53:58.387Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}