Vulnerability · Published Jul 23, 2026 · Assigned by GitHub_M

CVE-2026-47723nebula-mesh: Web UI and API responses lack security headers (CSP, X-Frame-Options, HSTS, etc.)

High 7.1

In plain English

A high-severity security flaw in nebula-mesh from juev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.5%top 55.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.1, none of the response paths in `internal/web/` or `internal/api/` set the standard browser-security headers. `grep` for `Content-Security-Policy`, `X-Frame-Options`, `Strict-Transport-Security`, `X-Content-Type-Options`, `Referrer-Policy` returns zero matches across the codebase. Version 0.3.1 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/juev/nebula-mesh	0.3.1	GHSA-w7w5-5gcp-38rw
Go	github.com/juev/nebula-mesh	0.3.1	GO-2026-5698

Affected products (as reported)

Vendor	Product	Versions
juev	nebula-mesh	< 0.3.1

Weakness: CWE-1021 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-w7w5-5gcp-38rw x_refsource_CONFIRM
https://github.com/forgekeep/nebula-mesh/commit/b45fda5476c41ffcff1ca23058aef0fb851359c1 x_refsource_MISC
https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.1 x_refsource_MISC