CVE-2026-48058: Juev Nebula-Mesh

Medium severity, CVSS 4.6. EPSS: 0.3% chance of exploitation in the next 30 days.

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.2, internal/web/session.go and internal/web/oidc.go set HttpOnly and SameSite=Lax on every cookie but never Secure. A single plaintext request to the origin (operator on a LAN, mistyped URL, HTTP→HTTPS not strictly enforced, reverse proxy misconfiguration) discloses the session. This issue has been patched in version 0.3.2.

Affected products

• Juev Nebula-Mesh: before 0.3.2 (fixed in 0.3.2)

Published 2026-07-28. Last modified 2026-07-30.