EUVD-2026-265946

fkie_cve-2026-22863

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.

GHSA-5379-f5hf-w38v — Deno node:crypto doesn't finalize cipher

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.…

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bdu:2026-00636

EUVD-2026-265946

fkie_cve-2026-22863

GHSA-5379-f5hf-w38v — Deno node:crypto doesn't finalize cipher