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NVD description
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, node:crypto.checkPrime(candidate[, options][, callback]) and crypto.checkPrimeSync(candidate[, 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 to the candidate was trial division by the primes up to 17,863. Any composite whose smallest prime factor exceeds that bound — for example the product of two primes just above it, such as 17,881 × 17,891 — was reported as true ("probably prime"). The same divergence affected the lower-level op_node_check_prime / op_node_check_prime_bytes paths that the polyfill calls into. This vulnerability is fixed in 2.8.1.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 HIGH: CVE-2026-49440 (CVSS 7.4) - Deno runtime crypto.checkPrime() fails to properly validate prime numbers, accepting composites as prime. Affects versions <2.8.1. Patch immediately. #CVE #Vulnerability #PatchNow https://t.co/bVEjVW6LZV
Post summary
The message announces CVE-2026-49440, details its crypto validation flaw, and urges users of Deno <2.8.1 to apply a patch.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | deno | deno | - | - | - |