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TI-2026-40059 Aliases CVE-2026-55513GHSA-g4x6-jcvr-9m3g

nebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hour bearer enrollment tokens

Priority MEDIUM 58CWE-613Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-613.

Summary

nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.3.0 to before version 0.5.0, the nebula-mgmt Web UI host-creation path ignores both the server-wide enrollment_token_ttl security setting and per-network network_config.enrollment_token_ttl overrides. API host creation and token-regeneration paths use the configured TTL resolver, but POST /ui/hosts hardcodes now.Add(24 * time.Hour) for newly minted agent enrollment tokens. In deployments that intentionally reduce enrollment-token lifetime, any authenticated operator who can create a host through the Web UI can still mint a bearer enrollment token valid for about 24 hours. This issue has been patched in version 0.5.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0032 25th percentileScored 2026-11-07
Fix Fixed nebula-mesh (forgekeep): 0.5.0github.com/forgekeep/nebula-mesh (Go): 0.5.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

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-mesh0.3.0 to before 0.5.00.5.0Patch availableCNA
—github.com/forgekeep/nebula-mesh (Go)0.3.0 to before 0.5.00.5.0Patch availableGHSA-g4x6-jcvr-9m3g
  • nebula-mesh Vendorforgekeep Affected 0.3.0 to before 0.5.0 Fixed in 0.5.0 Patch available CNA
  • github.com/forgekeep/nebula-mesh (Go) Vendor— Affected 0.3.0 to before 0.5.0 Fixed in 0.5.0 Patch available GHSA-g4x6-jcvr-9m3g

Remediation

  • Fix · CNA nebula-mesh (forgekeep) Fixed in 0.5.0
  • Fix · GHSA-g4x6-jcvr-9m3g github.com/forgekeep/nebula-mesh (Go) Fixed in 0.5.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55513
  2. 2026-10-03 Alias added: GHSA-g4x6-jcvr-9m3g

References

Other 4

  • TI-2026-44169 nebula-mesh: Certificate revocation is never enforced at the mesh CVSS 3.1HIGH 8.1
  • 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-2026-38659 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