Read the docs
TI-2026-35225 Aliases CVE-2026-47724GHSA-598g-h2vc-h5vg

nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation

Priority MEDIUM 43CWE-862Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.4, the `/api/v1/*` route surface trusts the bearer token alone for authorisation on most endpoints. The codebase itself admits this at `internal/api/hosts.go:384`: "API trusts the bearer token for authorisation; per-CA ownership is enforced only in the Web layer." The Web UI gates state-changing routes through `loadAccessibleCA` (`internal/web/cas.go`); CA-management endpoints in `internal/api/cas.go` ALSO have proper `canAccessCA` gates. The gap is on the host, network, firewall, mobile-bundle, and most operator endpoints. Combined with the per-operator CA model from ADR 0002, this gives any non-admin operator API key broad cross-tenant access — instant privilege escalation in the worst case. Version 0.3.4 fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00481 41st percentileScored 2026-11-07
Fix Fixed nebula-mesh (juev): 0.3.4github.com/juev/nebula-mesh (Go): 0.3.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
juevnebula-meshbefore 0.3.40.3.4Patch availableCNA
—github.com/juev/nebula-mesh (Go)before 0.3.40.3.4Patch availableGHSA-598g-h2vc-h5vg
  • nebula-mesh Vendorjuev Affected before 0.3.4 Fixed in 0.3.4 Patch available CNA
  • github.com/juev/nebula-mesh (Go) Vendor— Affected before 0.3.4 Fixed in 0.3.4 Patch available GHSA-598g-h2vc-h5vg

Remediation

  • Fix · CNA nebula-mesh (juev) Fixed in 0.3.4
  • Fix · GHSA-598g-h2vc-h5vg github.com/juev/nebula-mesh (Go) Fixed in 0.3.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47724
  2. 2026-10-03 Alias added: GHSA-598g-h2vc-h5vg

References

Other 4

  • TI-2026-35226 nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints CVSS 4.0MEDIUM 6.9
  • TI-2026-35227 nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator CVSS 4.0HIGH 7.1
  • TI-2026-35499 nebula-mesh: Session and OIDC state cookies lack the Secure attribute CVSS 4.0MEDIUM 4.6
  • TI-2026-36454 Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) CVSS 3.1HIGH 8.8
  • TI-2026-35223 nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml CVSS 4.0HIGH 8.7
  • TI-2026-35468 nebula-mesh: Decrypted CA private key persists in heap after signing CVSS 4.0MEDIUM 6.9
See all 8 →

Sources

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