CVE-2026-48058 nebula-mesh: Session and OIDC state cookies lack the Secure attribute
Attackers can steal session cookies via plaintext requests because the Secure attribute is missing, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48058?
CVE-2026-48058 is a medium-severity vulnerability in juev nebula-mesh, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-614
Which versions are affected by CVE-2026-48058?
3 open source packages ship an affected version, including github.com/juev/nebula-mesh.
| Package | Affected | Fixed in |
|---|---|---|
github.com/juev/nebula-mesh Go | All versions | 0.3.2 |
github.com/juev/nebula-mesh Go | All versions | 0.3.2 |
github.com/juev/nebula-mesh Go | All versions | 0.3.2 |
How do I fix CVE-2026-48058?
Upgrade github.com/juev/nebula-mesh to 0.3.2 or later.
Is CVE-2026-48058 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48058 exists.
Sources
Also known as GHSA-rqfj-vv8r-xhqc, GO-2026-5635.