Deno is a JavaScript, TypeScript, and WebAssembly runtime. Before 2.6.0, node:crypto doesn't finalize cipher. The vulnerability allows an attacker to have infinite encryptions. This can lead to naive attempts at brute forcing, as well as more refined attacks with the goal to learn the server secrets. This vulnerability is fixed in 2.6.0.

Affected: crates.io: deno

### Summary

The vulnerability allows an attacker to have infinite encryptions.

This can lead to naive attempts at brute forcing, as well as more refined attacks with the goal to learn the server secrets.

### PoC ```js import crypto from "node:crypto";

const key = crypto.randomBytes(32); const iv = crypto.randomBytes(16); const cipher = crypto.createCipheriv("aes-256-cbc", key, iv); cipher.final()

console.log(cipher); ```

### Expected Output ```js Cipheriv { _decoder: null, _options: undefined, Symbol(kHandle): CipherBase {} } ```

### Actual Output ```js Cipheriv { _events: { close: undefined, error: undefined, prefinish: [Function: prefinish], finish: undefined, drain: undefined, data: undefined, end: undefined, readable: undefined }, _readableState: ReadableState { highWaterMark: 65536, buffer: [], bufferIndex: 0, length: 0, pipes: [], awaitDrainWriters: null, [Symbol(kState)]: 1048844 }, _writableState: WritableState { highWaterMark: 65536, length: 0, corked: 0, onwrite: [Function: bound onwrite], writelen: 0, bufferedIndex: 0, pendingcb: 0, [Symbol(kState)]: 17580812, [Symbol(kBufferedValue)]: null }, allowHalfOpen: true, _final: [Function: final], _maxListeners: undefined, _transform: [Function: transform], _eventsCount: 1, [Symbol(kCapture)]: false, [Symbol(kCallback)]: null } ```

### Mitigations

All users should upgrade to Deno v2.6.…