CVE-2026-6959: Github.com/hashicorp/nomad HashiCorp Nomad Vulnerable To Symlink Vulnerability

MODERATE
Advisory Identifier: GHSA-3934-423w-4jq3
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CVSS 6.0
CWE-59
Published
Advisory Summary

CVE-2026-6959 is a MODERATE (CVSS 6.0) hashicorp nomad vulnerable to symlink vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Github.com/hashicorp/nomad libraries in the Go ecosystem. The issue involves hashicorp nomad vulnerable to symlink attack. Remediation is available by upgrading affected packages to version 1.11.0-rc.1.0.20260512123500-2a09fd62c238.

CVE-2026-6959 at a Glance

CVE Identifier CVE-2026-6959
GHSA Identifier GHSA-3934-423w-4jq3
Severity MODERATE
CVSS v3.1 Base Score 6.0
CWE Classification CWE-59: Improper Link Resolution Before File Access ('Link Following')
Affected Product Github.com/hashicorp/nomad
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-6959

To remediate this vulnerability, upgrade all affected Github.com/hashicorp/nomad dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/hashicorp/nomad fixed: 1.11.0-rc.1.0.20260512123500-2a09fd62c238 
Upgrade github.com/hashicorp/nomad to 1.11.0-rc.1.0.20260512123500-2a09fd62c238
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/hashicorp/nomad

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-6959, inspect your project dependencies for Github.com/hashicorp/nomad:

inspect dependencies for github.com/hashicorp/nomad

Analyze the terminal output to locate any version of Github.com/hashicorp/nomad in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.0-rc.1.0.20260512123500-2a09fd62c238), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In Github.com/hashicorp/nomad, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

HashiCorp Nomad and Nomad Enterprise prior to 2.0.1 are vulnerable to arbitrary file read and write on the client host as the Nomad process user through a symlink attack. This vulnerability (CVE-2026-6959) is fixed in Nomad 2.0.1, 1.11.5 and 1.10.11.

CVE-2026-6959 Affected Github.com/hashicorp/nomad Versions

1 component(s)
Fixed Versions:
1.11.0-rc.1.0.20260512123500-2a09fd62c238
Product / Package Ecosystem Affected Versions Fixed Version
github.com/hashicorp/nomad
golang/github.com/hashicorp/nomad
Go
< 1.11.0-rc.1.0.20260512123500-2a09fd62c238
1.11.0-rc.1.0.20260512123500-2a09fd62c238

References

NVD — CVE-2026-6959 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6959
Security Fix Commit FIX COMMIT
https://github.com/hashicorp/nomad/commit/2a09fd62c23880ff306499ae03fe64628d82a23f
discuss.hashicorp.com/t/hcsec-2026-14-nom... WEB
https://discuss.hashicorp.com/t/hcsec-2026-14-nomad-arbitrary-file-read-write-on-client-host-through-symlink-attack/77416
Github.com/hashicorp/nomad Source Repository REPOSITORY
https://github.com/hashicorp/nomad
Github.com/hashicorp/nomad Release RELEASE
https://github.com/hashicorp/nomad/releases/tag/v2.0.1

Frequently Asked Questions

What is CVE-2026-6959?
CVE-2026-6959 is a security vulnerability in Github.com/hashicorp/nomad involving HashiCorp Nomad vulnerable to symlink attack under CWE-59: Improper Link Resolution Before File Access ('Link Following').
Which Github.com/hashicorp/nomad versions are affected?
Affected versions include releases prior to 1.11.0-rc.1.0.20260512123500-2a09fd62c238 across affected packages: github.com/hashicorp/nomad.
What version fixes CVE-2026-6959?
Upgrading to 1.11.0-rc.1.0.20260512123500-2a09fd62c238 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/hashicorp/nomad affected?
Yes, github.com/hashicorp/nomad is affected in releases prior to 1.11.0-rc.1.0.20260512123500-2a09fd62c238. Upgrade your dependency to 1.11.0-rc.1.0.20260512123500-2a09fd62c238 or later.
What is the CVSS score of CVE-2026-6959?
CVE-2026-6959 has a CVSS v3.1 base score of 6.0 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N.
What CWE is associated with CVE-2026-6959?
CVE-2026-6959 is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following') (The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.).
How can I check Go dependencies for CVE-2026-6959?
Run the dependency tree command: 'inspect dependencies for github.com/hashicorp/nomad'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3934-423w-4jq3",
  "modified" : "2026-05-19T15:39:41Z",
  "published" : "2026-05-12T21:31:35Z",
  "aliases" : [ "CVE-2026-6959" ],
  "summary" : "HashiCorp Nomad vulnerable to symlink attack",
  "details" : "HashiCorp Nomad and Nomad Enterprise prior to 2.0.1 are vulnerable to arbitrary file read and write on the client host as the Nomad process user through a symlink attack. This vulnerability (CVE-2026-6959) is fixed in Nomad 2.0.1, 1.11.5 and 1.10.11.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/hashicorp/nomad"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.0-rc.1.0.20260512123500-2a09fd62c238"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6959"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/nomad/commit/2a09fd62c23880ff306499ae03fe64628d82a23f"
  }, {
    "type" : "WEB",
    "url" : "https://discuss.hashicorp.com/t/hcsec-2026-14-nomad-arbitrary-file-read-write-on-client-host-through-symlink-attack/77416"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hashicorp/nomad"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hashicorp/nomad/releases/tag/v2.0.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-59" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-19T15:39:41Z",
    "nvd_published_at" : "2026-05-12T20:16:46Z"
  }
}