CVE-2026-49440 Deno: Miller-Rabin Primality Test Allows Zero Rounds

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, node:crypto.checkPrimecandidate, options, callback and crypto.checkPrimeSynccandidate, options ran no Miller-Rabin rounds at all when the caller left options.checks at its default of 0. In that mode, the only test applied ...

CVE-2026-49440

Summary: CVE-2026-49440 affects Deno’s crypto.primality tests when using default options (checks=0) for checkPrime/checkPrimeSync, causing some composites to be reported as prime due to zero Miller-Rabin rounds. This occurs in the node:crypto path and related op_node_check_prime implementations; ...