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Root.Mkdir(All) can follow junctions out of the root on Windows in os

Assessment

Severity
Critical
CVSS base score
9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact
Not stated
EPSS · 30-day forecast
No EPSS score collected
Public detection template
No Nuclei template is listed in the current collected catalog
Exploitation detected
Unknown: not stated by MSRC
Exploitability
Not assessed
Publicly disclosed
Unknown: not stated by MSRC
Customer action
Required: follow the MSRC remediation guidance
Component
Mariner
Weakness
CWE-1386: Insecure Operation on Windows Junction / Mount Point
Issued by
Go
Published
11 Oct 2026 · October 2026
Last revised
12 Oct 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software
2 affected products
  • azl3 golang 1.26.7-1 on Azure Linux 3.0
  • azl3 golang 1.27.1-1 on Azure Linux 3.0

What changed

  1. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  3. Detection template: Unknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  4. Detection template: No Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  5. Detection template: No Nuclei template listed · Customer action: Required: apply the update → Required: follow the MSRC remediation guidance · Public disclosure: No → Unknown: not stated by MSRC · Exploitation detected: Not reported by MSRC → Unknown: not stated by MSRC
  6. Detection template: Unknown: exploit-code evidence is incomplete or retained → No Nuclei template listed · CISA KEV: Unknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  7. Detection template: No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained · CISA KEV: Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (35)

Up to 100 recent field edits are shown; older edits may be outside retention.

  1. 6 Nov 2026 · 17:32:22 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  2. 6 Nov 2026 · 17:32:22 UTC Source coverage: public-exploit-codeIncomplete → Current
  3. 6 Nov 2026 · 17:32:22 UTC Source coverage: first-epssIncomplete → Current
  4. 6 Nov 2026 · 17:32:22 UTC Source coverage: msrc-cvrfIncomplete → Current
  5. 6 Nov 2026 · 16:31:02 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  6. 6 Nov 2026 · 16:31:02 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  7. 6 Nov 2026 · 16:31:02 UTC Source coverage: first-epssCurrent → Incomplete
  8. 6 Nov 2026 · 16:31:02 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  9. 2 Nov 2026 · 17:30:39 UTC Public detection templateUnknown: detection-template evidence is incomplete or retained → No Nuclei template listed
  10. 2 Nov 2026 · 17:30:39 UTC Source coverage: public-exploit-codeIncomplete → Current
  11. 2 Nov 2026 · 17:30:39 UTC Source coverage: first-epssIncomplete → Current
  12. 2 Nov 2026 · 17:30:39 UTC Source coverage: msrc-cvrfIncomplete → Current
  13. 2 Nov 2026 · 16:27:39 UTC Public detection templateNo Nuclei template listed → Unknown: detection-template evidence is incomplete or retained
  14. 2 Nov 2026 · 16:27:39 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  15. 2 Nov 2026 · 16:27:39 UTC Source coverage: first-epssCurrent → Incomplete
  16. 2 Nov 2026 · 16:27:39 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  17. 29 Oct 2026 · 20:19:26 UTC Public detection templateNo Nuclei template listed
  18. 29 Oct 2026 · 20:19:26 UTC EPSSNot scored → No EPSS score collected
  19. 29 Oct 2026 · 20:19:26 UTC Customer actionRequired: apply the update → Required: follow the MSRC remediation guidance
  20. 29 Oct 2026 · 20:19:26 UTC Publicly disclosedNo → Unknown: not stated by MSRC
  21. 29 Oct 2026 · 20:19:26 UTC Exploitation detectedNot reported by MSRC → Unknown: not stated by MSRC
  22. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  23. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  24. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  25. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  26. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  27. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  28. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  29. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  30. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  31. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  32. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  33. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
  34. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  35. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current

Explore global source statements, affected packages and advisory history for CVE-2026-56857. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-56857

Published

os

https://pkg.go.dev

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Go standard library",
                    "product": "os",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "os",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "1.26.9",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "1.27.0-0",
                            "lessThan": "1.27.2",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "platforms": [
                        "windows"
                    ],
                    "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"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

internal/syscall/windows

https://pkg.go.dev

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Go standard library",
                    "product": "internal/syscall/windows",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "internal/syscall/windows",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "1.26.9",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "1.27.0-0",
                            "lessThan": "1.27.2",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "platforms": [
                        "windows"
                    ],
                    "programRoutines": [
                        {
                            "name": "Mkdirat"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-95420

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Oct 8, 2026, 10:53:58 PM

dateUpdated: Oct 9, 2026, 3:36:01 PM

14 related source bulletins · separate from aliases

RHSA-2026:92480: Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.1.14

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

RHSA-2026:92451: Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.0.17

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

RHSA-2026:92497: Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.11

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

RHSA-2026:92516: Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.4.4

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

openSUSE-SU-2026:22093-1: Security update for go1.27

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

SUSE-SU-2026:24237-1: Security update for go1.27

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

RHSA-2026:92509: Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.3.9

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

openSUSE-SU-2026:12101-1: go1.27-1.27.2-1.1 on GA media

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

WID-SEC-W-2026-3841: Golang Go: Mehrere Schwachstellen

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

msrc_CVE-2026-56857: Root.Mkdir(All) can follow junctions out of the root on Windows in os

CVE-2026-56857

openSUSE-SU-2026:22095-1: Security update for go1.26

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78667 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

openSUSE-SU-2026:12093-1: go1.26-1.26.9-1.1 on GA media

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78667 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

openSUSE-SU-2026:12112-1: rclone-1.75.2-1.1 on GA media

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-84445 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

SUSE-SU-2026:24239-1: Security update for go1.26

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78667 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-56857

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-1386

Original publisher date fields

published: 2026-10-08T23:17:01.487

lastModified: 2026-10-09T16:35:35.900

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GO-2026-6604

Published

stdlib

Go

SEMVER · introduced 0 → fixed 1.26.9 → introduced 1.27.0-0 → fixed 1.27.2

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 9 Nov 11:51 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current