CVE Watch8 sept 2026

CVE-2026-61699

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

CVSS

8.1

Alto

EPSS

0.4%

p37

KEV

—

Exploit Today

0-100

Publicado: 4 sept 2026 · Última mod.: 8 sept 2026 · CWE-299 · CWE-672

EPSS · 30d

0.2%EPSS · 30 días0.4%

2026-09-212026-10-19

Descripción técnica

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.

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