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.

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.

### 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 v2.6.0 or newer.

### 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 v2.6.0 or newer.

Deno es un entorno de ejecución de JavaScript, TypeScript y WebAssembly. Antes de la versión 2.6.0, node:crypto no finaliza el cifrado. La vulnerabilidad permite a un atacante tener cifrados infinitos. Esto puede llevar a intentos ingenuos de fuerza bruta, así como a ataques más refinados con el objetivo de aprender los secretos del servidor. Esta vulnerabilidad está corregida en la versión 2.6.0.