{"cve":"CVE-2026-53602","nvd":{"published":"2026-09-04T20:17:23.130","modified":"2026-09-08T21:05:26.920","status":"Deferred","description":"nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.7, two related authorization gaps let a host that should no longer be trusted obtain a fresh, valid Nebula certificate, because nebula-mgmt does not re-evaluate revocation/authorization state at certificate issuance time — only at poll time. Firstly, the blocklist is not enforced at sign / re-enroll time. internal/api/enroll.go:128 calls caMgr.Sign(...) without consulting the blocklist. The blocklist is only checked in the poll path (internal/api/updates.go:57, fingerprintInBlocklist). The blocklist is keyed by certificate fingerprint (internal/store/sqlite.go), so a re-enrollment produces a new fingerprint that is not in the blocklist. Secondly, renewal does not re-validate operator / CA status. Auto-renewal at poll time (internal/api/updates.go:285-319, signHostCert) reads host.Name, host.Groups, host.NebulaIPs from the DB and re-signs without checking whether the owning operator is still active or the CA still valid. DisableOperator (internal/store/sqlite_operators.go) revokes sessions and API keys but does not retire the operator's CAs, and pki/signer.go checks only CA cert time-expiry, not operator/CA status. This issue has been patched in version 0.3.7.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9},"cvss_v3":null,"cwes":["CWE-285","CWE-862"],"references":["https://github.com/forgekeep/nebula-mesh/issues/178","https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.7","https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-339v-266x-79xr"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-53602","score":0.00309,"percentile":0.23759,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-339v-266x-79xr","url":"https://osv.dev/vulnerability/GHSA-339v-266x-79xr","summary":"nebula-mesh: Host revocation is not durable - blocked/offboarded hosts can regain a valid certificate","modified":"2026-07-21T19:19:22.992828567Z","packages":[{"ecosystem":"Go","name":"github.com/forgekeep/nebula-mesh","purl":"pkg:golang/github.com/forgekeep/nebula-mesh","ranges":["<0.3.7"],"fixed":["0.3.7"]}]},{"id":"GO-2026-5950","url":"https://osv.dev/vulnerability/GO-2026-5950","summary":"nebula-mesh: Host revocation is not durable - blocked/offboarded hosts can regain a valid certificate in github.com/forgekeep/nebula-mesh","modified":"2026-07-21T19:15:29.245965014Z","packages":[{"ecosystem":"Go","name":"github.com/forgekeep/nebula-mesh","purl":"pkg:golang/github.com/forgekeep/nebula-mesh","ranges":["<0.3.7"],"fixed":["0.3.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}