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CVE-2026-56857VulnerabilityPublished Updated

Golang 1.10: On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location

Affects golang-1.10Source GCVE Database

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Authoritative record:CVE-2026-56857· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10golang-1.26pkg:deb/ubuntu/golang-1.26?arch=source&distro=stonkingOther threatsAffected
  • 1.26.0-1 – 1.26.8-2
8 affected builds
Fixed in–
Ubuntu 26.10golang-1.27pkg:deb/ubuntu/golang-1.27?arch=source&distro=stonkingOther threatsAffected
  • 1.27.0-1 – 1.27~rc3-1
5 affected builds
Fixed in–
Ubuntu 26.04 LTSgolang-1.23pkg:deb/ubuntu/golang-1.23?arch=source&distro=resoluteOther threatsAffected
  • =1.23.10-1
Fixed in–
Ubuntu 26.04 LTSgolang-1.24pkg:deb/ubuntu/golang-1.24?arch=source&distro=resoluteOther threatsAffected
  • =1.24.4-1ubuntu1
  • =1.24.9-1
  • =1.24.13-2
Fixed in–
Ubuntu 26.04 LTSgolang-1.25pkg:deb/ubuntu/golang-1.25?arch=source&distro=resoluteOther threatsAffected
  • =1.25.0-0ubuntu1
  • =1.25.7-2
  • =1.25.14-1~ubuntu0.26.04.1
Fixed in–
Ubuntu 26.04 LTSgolang-1.26pkg:deb/ubuntu/golang-1.26?arch=source&distro=resoluteOther threatsAffected
  • =1.26~rc3-2
  • =1.26.0-1
  • =1.26.8-1~ubuntu0.26.04.2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a fix is available, avoid using Root.Mkdir or Root.MkdirAll on junctions pointing to empty locations or implement additional validation to restrict directory creation within intended boundaries.

Description

A vulnerability in Golang 1.10 on Windows allows directory creation at junction targets outside the intended root when using Root.Mkdir or Root.MkdirAll on junctions pointing to empty locations. This affects operations where the last path component is a junction. The flaw can lead to unauthorized directory creation outside the root directory.

References

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