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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: 2026-10-09 15:36
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
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 15:35 UTC
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) |
{
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"timestamp": "2026-10-09T15:35:58.663117Z",
"version": "2.0.3"
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{
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{
"cweId": "CWE-1386",
"description": "CWE-1386 Insecure Operation on Windows Junction / Mount Point",
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}
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],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"title": "CISA ADP Vulnrichment"
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],
"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"
}
],
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"status": "affected",
"version": "1.27.0-0",
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}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "internal/syscall/windows",
"platforms": [
"windows"
],
"product": "internal/syscall/windows",
"programRoutines": [
{
"name": "Mkdirat"
}
],
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"status": "affected",
"version": "0",
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{
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"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
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}
],
"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": [
{
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},
"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": {
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"datePublished": "2026-10-08T22:53:58.387Z",
"dateReserved": "2026-06-23T15:10:49.353Z",
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CVE-2026-56857 (GCVE-0-2026-56857)
Vulnerability from cvelistv5 – Published: 2026-10-08 22:53 – Updated: 2026-10-09 15:36
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
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 15:35 UTC
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": {
"adp": [
{
"metrics": [
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-56857",
"options": [
{
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},
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},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-09T15:35:58.663117Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1386",
"description": "CWE-1386 Insecure Operation on Windows Junction / Mount Point",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-09T15:36:01.712Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"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",
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"lessThan": "1.26.9",
"status": "affected",
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"versionType": "semver"
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"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",
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{
"lessThan": "1.26.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
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"lessThan": "1.27.2",
"status": "affected",
"version": "1.27.0-0",
"versionType": "semver"
}
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}
],
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}
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{
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}
],
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{
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{
"description": "CWE-1386: Insecure Operation on Windows Junction / Mount Point",
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}
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},
{
"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"
}
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