CVE-2026-55512

    Dashboard / Vulnerabilities / CVE-2026-55512

    CVE-2026-55512

    Published: 4 Sept 2026Last Modified: 11 Sept 2026

    Summary: nebula-mesh: Unauthenticated OIDC login endpoint allocates unbounded in-memory state entries without rate limiting

    Details: 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.

    References: https://github.com/forgekeep/nebula-mesh/releases/tag/v0.5.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55512.json, https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-m3cx-mwpg-32jg, https://nvd.nist.gov/vuln/detail/CVE-2026-55512, https://github.com/forgekeep/nebula-mesh/commit/bc387086cc0e4b9c1654468b7391af19cacfe367

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0e34833a1c18e57485c0fe590b294f9e960404ee
    Fixed -7186b86821fc210f191eb44bcb52ef108149f02c

    Affected versions

    v0.4.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-55512 | CVE-DB