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windows

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).

On Windows, the Go standard library's os package has a vulnerability (CVE-2026-56857) related to insecure handling of junctions or mount points during directory creation operations (Root.Mkdir or Root.MkdirAll). When the target path's last component is a junction pointing to an empty location, the operation can create directories outside the intended root directory. This behavior violates expected path confinement and may lead to unauthorized directory creation outside the root. The issue affects versions >=0 <1.26.9 and >=1.27.0 <1.27.2 of the Go standard library os package.

CVE-2026-56857 is a vulnerability in the Go standard library's os package affecting Windows systems. It involves insecure operations on Windows junctions or mount points during directory creation. Specifically, when Root.Mkdir or Root.MkdirAll targets a junction pointing to an empty location, a dire

CVE-2026-56857: CWE-1386: Insecure Operation on Windows Junction / Mount Point in Go standard library os

NewNTUnicodeString does not check for string length overflow. When provided with a string that overflows the maximum size of a NTUnicodeString (a 16-bit number of bytes), it returns a truncated string rather than an error.

The vulnerability in golang.org/x/sys/windows (CVE-2026-39824) involves the NewNTUnicodeString function failing to validate the length of input strings against the maximum size allowed by the NTUnicodeString structure, which uses a 16-bit length field. When an input string length exceeds this maximum, the function truncates the string silently rather than returning an error, leading to an integer overflow or wraparound condition. This can result in unexpected behavior or data integrity issues in applications relying on this function for Unicode string handling on Windows systems.

Detailed information about CVE-2026-39824: CWE-190: Integer Overflow or Wraparound in golang.org/x/sys golang.org/x/sys/windows affecting golang.org/x/sys golan

CVE-2026-39824: CWE-190: Integer Overflow or Wraparound in golang.org/x/sys golang.org/x/sys/windows - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-39824: CWE-190: Integer Overflow or Wraparound in golang.org/x/sys golang.org/x/sys/windows


CVE-2026-56857: CWE-1386: Insecure Operation on Windows Junction / Mount Point in Go standard library osCVE-2026-56857 0 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). CriticalVulnerability#cve #cve-2026-56857 #cwe-1386 Join the discussion	CVE Database V5	10/09/2026, 00:00:00 UTC Added: 10/08/2026, 23:04:03 UTC
CVE-2026-39824: CWE-190: Integer Overflow or Wraparound in golang.org/x/sys golang.org/x/sys/windowsCVE-2026-39824 0 NewNTUnicodeString does not check for string length overflow. When provided with a string that overflows the maximum size of a NTUnicodeString (a 16-bit number of bytes), it returns a truncated string rather than an error. LowVulnerability#cve #cve-2026-39824 #cwe-190 Join the discussion	CVE Database V5	05/22/2026, 19:39:47 UTC Added: 05/22/2026, 19:59:48 UTC

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