Medium severity · published Jul 28, 2026
CVE-2026-48058
nebula-mesh: Session and OIDC state cookies lack the Secure attribute
4.6
CVSS
0.2%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
nebula-mesh · juev
< 0.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48058
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48058
github.com
https://github.com/forgekeep/nebula-mesh/commit/ffdd67dbf221d9a5855c39fbe11b49c245048d85
github.com
https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.2
github.com
https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-rqfj-vv8r-xhqc
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