CVE-2026-53602

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.7, two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate issuance time — only at poll time. Firstly, the blocklist is not enforced at sign / re-enroll time. internal/api/enroll.go:128 calls caMgr.Sign(...) without consulting the blocklist. The blocklist is only checked in the poll path (internal/api/updates.go:57, fingerprintInBlocklist). The blocklist is keyed by certificate fingerprint (internal/store/sqlite.go), so a re-enrollment produces a new fingerprint that is not in the blocklist. Secondly, renewal does not re-validate operator / CA status. Auto-renewal at poll time (internal/api/updates.go:285-319, signHostCert) reads host.Name, host.Groups, host.NebulaIPs from the DB and re-signs without checking whether the owning operator is still active or the CA still valid. DisableOperator (internal/store/sqlite_operators.go) revokes sessions and API keys but does not retire the operator's CAs, and pki/signer.go checks only CA cert time-expiry, not operator/CA status. This issue has been patched in version 0.3.7.

• CWE-285
• CWE-862

• https://github.com/forgekeep/nebula-mesh/issues/178
• https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.7
• https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-339v-266x-79xr

Published

Sep 4, 2026

Last Modified

Sep 8, 2026

Status

Deferred

• Uncovering a hidden BOLA in Appsmith's snapshot logicStrix autonomously discovered a BOLA/IDOR vulnerability in Appsmith's snapshot deletion path.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-53596FreeScout is a free help desk and shared inbox built with PH…5.3
• CVE-2026-53597Prompty is a markdown file format (.prompty) for LLM prompts…8.7
• CVE-2026-53598Prompty is a markdown file format (.prompty) for LLM prompts…7.5
• CVE-2026-53599REDAXO is a PHP-based content management system. From 5.18.2…7.5
• CVE-2026-5360A vulnerability has been found in Free5GC 4.2.0. The affecte…3.7
• CVE-2026-53600async-tar is a tar archive reading/writing library for async…6.3
• CVE-2026-53603nebula-mesh is a self-hosted control plane for Slack Nebula …7.1
• CVE-2026-53604nebula-mesh is a self-hosted control plane for Slack Nebula …7.1
• CVE-2026-53606ApostropheCMS is an open-source Node.js content management s…5.4
• CVE-2026-53607ApostropheCMS is an open-source Node.js content management s…3.7
• CVE-2026-53608ApostropheCMS is an open-source Node.js content management s…8.7
• CVE-2026-53609ApostropheCMS is an open-source Node.js content management s…9.1