GHSA-3934-423w-4jq3 CVE-2026-6959 GO-2026-5076
HashiCorp Nomad vulnerable to symlink attack
- Severity
- 6.0 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 0.17%
- Chance of exploitation in the next 30 days. Higher than 6.19% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
- Fix
1.11.0-rc.1.0.20260512123500-2a09fd62c238- Upgrade github.com/hashicorp/nomad to this version or later
Description
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.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| github.com/hashicorp/nomad | < 1.11.0-rc.1.0.20260512123500-2a09fd62c238 |
1.11.0-rc.1.0.20260512123500-2a09fd62c238 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
github.com/hashicorp/nomad Go → 1.11.0-rc.1.0.20260512123500-2a09fd62c238
- go
go get github.com/hashicorp/nomad@v1.11.0-rc.1.0.20260512123500-2a09fd62c238 && go mod tidy
Severity breakdown
CVSS 3.1 6.0
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Weakness
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 to prevent it
- Architecture and Design: Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-hx53-77qj-8663 HashiCorp Nomad vulnerable to a path traversal | High | Also affects github.com/hashicorp/nomad |
| GHSA-rx97-6c62-55mf Hashicorp Nomad Incorrect Privilege Assignment vulnerability | High | Also affects github.com/hashicorp/nomad |
| GHSA-c3q9-q986-vrwh Nomad is vulnerable to unintentional exposure of the workload identity token and client secret token in audit logs | Medium | Also affects github.com/hashicorp/nomad |
| GHSA-hr68-hvgv-xxqf Hashicorp Nomad Incorrect Privilege Assignment vulnerability | Medium | Also affects github.com/hashicorp/nomad |
| GHSA-2w5v-x29g-jw7j Hashicorp Nomad Incorrect Authorization vulnerability | High | Also affects github.com/hashicorp/nomad |
| GHSA-25qx-vfw2-fw8r Nomad Vulnerable to Allocation Directory Escape On Non-Existing File Paths Through Archive Unpacking | Medium | Also affects github.com/hashicorp/nomad |
| GHSA-5mqx-rpxv-mvxj HashiCorp Nomad is vulnerable to path escape through archive unpacking during migration | High | Also affects github.com/hashicorp/nomad |
| GHSA-c866-8gpw-p3mv HashiCorp Nomad vulnerable to symlink attacks | High | Also affects github.com/hashicorp/nomad |
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