Vulnerability · Published Jul 28, 2026 · Assigned by GitHub_M
CVE-2026-48058nebula-mesh: Session and OIDC state cookies lack the Secure attribute
Medium 4.6
In plain English
A medium-severity security flaw in nebula-mesh from juev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/juev/nebula-mesh | 0.3.2 | GHSA-rqfj-vv8r-xhqc |
| Go | github.com/juev/nebula-mesh | 0.3.2 | GO-2026-5635 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| juev | nebula-mesh | < 0.3.2 |
Weakness: CWE-614 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U