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TI-2026-44169 Aliases CVE-2026-61699GHSA-cm26-5974-52h8

nebula-mesh: Certificate revocation is never enforced at the mesh

Priority HIGH 70CWE-299Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00446 38th percentileScored 2026-11-07
Fix Fixed nebula-mesh (forgekeep): 0.7.1github.com/forgekeep/nebula-mesh (Go): 0.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
forgekeepnebula-meshbefore 0.7.10.7.1Patch availableCNA
—github.com/forgekeep/nebula-mesh (Go)before 0.7.10.7.1Patch availableGHSA-cm26-5974-52h8
  • nebula-mesh Vendorforgekeep Affected before 0.7.1 Fixed in 0.7.1 Patch available CNA
  • github.com/forgekeep/nebula-mesh (Go) Vendor— Affected before 0.7.1 Fixed in 0.7.1 Patch available GHSA-cm26-5974-52h8

Remediation

  • Fix · CNA nebula-mesh (forgekeep) Fixed in 0.7.1
  • Fix · GHSA-cm26-5974-52h8 github.com/forgekeep/nebula-mesh (Go) Fixed in 0.7.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-61699
  2. 2026-10-03 Alias added: GHSA-cm26-5974-52h8

References

Other 4

  • TI-2026-45231 Nebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private` CVSS 3.1HIGH 7.7
  • TI-2026-40058 nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entries without rate limiting CVSS 3.1MEDIUM 5.3
  • TI-2026-40059 nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hour bearer enrollment tokens CVSS 3.1MEDIUM 5.4
  • TI-2026-38659 nebula-mesh: Operator session tokens stored in plaintext in the database CVSS 4.0HIGH 7.1
  • TI-2026-38660 nebula-mesh: CA private key not zeroized on web mobile-bundle error paths CVSS 4.0HIGH 7.1
  • TI-2026-38658 nebula-mesh - Host revocation is not durable: blocked/offboarded hosts can regain a valid certificate CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences