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CVE-2026-53602 is an authorization flaw in nebula-mesh in which certificate issuance and renewal logic does not properly re-evaluate current authorization and revocation state before signing Nebula certificates. As a result, hosts that have been blocked or offboarded can still obtain new valid certificates through re-enrollment, and hosts originally provisioned by an operator whose privileges were later disabled can continue to renew certificates. The weakness stems from missing or insufficient authorization checks in the enrollment and renewal paths, including failure to enforce blocklist and host-status validation and failure to re-validate operator and certificate authority status at renewal time.
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No public exploit code observed for this vulnerability.
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