CVE-2026-47723: Juev Nebula-Mesh

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.1, none of the response paths in `internal/web/` or `internal/api/` set the standard browser-security headers. `grep` for `Content-Security-Policy`, `X-Frame-Options`, `Strict-Transport-Security`, `X-Content-Type-Options`, `Referrer-Policy` returns zero matches across the codebase. Version 0.3.1 fixes the issue.

Affected products

• Juev Nebula-Mesh: before 0.3.1 (fixed in 0.3.1)

Published 2026-07-23. Last modified 2026-07-30.