CVE-2026-55512: medium-severity vulnerability in forgekeep nebula-mesh
nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entries without rate limiting
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.6%
nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. From version 0.2.0 to before version 0.5.0, when OIDC is enabled, GET /ui/oidc/login is reachable without authentication and is registered outside the Web UI rate-limited auth routes. Every request creates a fresh random OIDC state value and stores it in an in-memory map for 10m. Expired states are swept lazily, but there is no rate limit or maximum live-state cap on the allocation path. An unauthenticated remote client can therefore grow OIDC.states for the full state TTL, bounded by request throughput rather than by configured auth rate limits. This issue has been patched in version 0.5.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
forgekeep · nebula-meshRelated CVEs — forgekeep nebula-mesh
In the same product, most dangerous first.
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%CVE-2026-53604HIGHnebula-mesh: CA private key not zeroized on web mobile-bundle error pathsEPSS 0.2%