Vulnerability Description
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, the web handler renderMobileBundle passes the real *pki.CAResolver directly into mobilebundle.Build. Inside Build, resolver.LoadByID decrypts the CA's ed25519 private key into a *pki.CAManager, but Build never calls CAManager.Wipe() on any return path. As a result, when a mobile-bundle request goes through the web UI and Build returns — especially on error (missing network, invalid prefix, DB error, signing failure) — the plaintext CA private key remains on the Go heap, unwiped, until garbage collection. An attacker able to read process memory (core dump, swap, memory-scraping) can recover the CA signing key, which would allow minting arbitrary host certificates for the mesh. The API handler already does this correctly: it loads the CAManager, defer caMgr.Wipe(), and wraps it in caManagerResolver. Only the web path is affected. This issue has been patched in version 0.3.8.
Related Weaknesses (CWE)
References
- https://github.com/forgekeep/nebula-mesh/commit/1f1ab9aa8472239763d967e3d50a3cd5
- https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.8
- https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-2p2f-px33-4vv5
FAQ
What is CVE-2026-53604?
CVE-2026-53604 is a documented vulnerability. nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, the web handler renderMobileBundle passes the real *pki.CAResolver directly into mobilebundle.Build. Insid...
How severe is CVE-2026-53604?
CVSS scoring is not yet available for CVE-2026-53604. Check NVD for updates.
Is there a patch for CVE-2026-53604?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.