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CVE-2026-93402 is an authorization flaw in rsyslog's optional imdtls input module. When DTLS is configured with tls.authmode set to "name" or "fingerprint", the module does not terminate or reject an established DTLS session when the tls.permittedpeer identity check fails. It logs a warning but retains the session and forwards received DTLS records to the configured rsyslog ruleset.
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No public exploit code observed for this vulnerability.
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A medium-severity authentication/authorization enforcement flaw in rsyslog's optional imdtls input module. A remote peer with a certificate trusted by the configured CA, but whose name or fingerprint is absent from tls.permittedpeer, can inject chosen syslog records into the configured input stream after a successful DTLS handshake. The stated impact is limited to input-stream integrity; it does not enable log disclosure, alteration or deletion of existing logs, memory corruption, or code execution.
A remotely exploitable, low-complexity vulnerability with no required privileges or user interaction, rated CVSS v3 9.8, affecting Debian Linux 12.0, 13.0, and 14.0 according to the referenced plugin metadata.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.