CVE-2026-53604: high-severity vulnerability in forgekeep nebula-mesh
nebula-mesh: CA private key not zeroized on web mobile-bundle error paths
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, the web handler renderMobileBundle passes the real *pki.CAResolver directly into mobilebundle.Build. Inside Build, resolver.LoadByID decrypts the CA's ed25519 private key into a *pki.CAManager, but Build never calls CAManager.Wipe() on any return path. As a result, when a mobile-bundle request goes through the web UI and Build returns — especially on error (missing network, invalid prefix, DB error, signing failure) — the plaintext CA private key remains on the Go heap, unwiped, until garbage collection. An attacker able to read process memory (core dump, swap, memory-scraping) can recover the CA signing key, which would allow minting arbitrary host certificates for the mesh. The API handler already does this correctly: it loads the CAManager, defer caMgr.Wipe(), and wraps it in caManagerResolver. Only the web path is affected. This issue has been patched in version 0.3.8.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
forgekeep · nebula-meshRelated CVEs — forgekeep nebula-mesh
In the same product, most dangerous first.
CVE-2026-55512MEDIUMnebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entries without rate limitingEPSS 0.6%CVE-2026-63464HIGHNebula-mesh allows non-admin operators to disable webhook SSRF protection via `allow_private`EPSS 0.5%CVE-2026-61699HIGHnebula-mesh: Certificate revocation is never enforced at the meshEPSS 0.4%CVE-2026-53603HIGHnebula-mesh: Operator session tokens stored in plaintext in the databaseEPSS 0.4%CVE-2026-55513MEDIUMnebula-mesh: Web UI host creation ignores configured enrollment token TTL and mints 24-hour bearer enrollment tokensEPSS 0.3%CVE-2026-53602MEDIUMnebula-mesh - Host revocation is not durable: blocked/offboarded hosts can regain a valid certificateEPSS 0.3%