Language: TypeScript
Label: vulnerable
CWE: CWE-331 \u2014 Insufficient Entropy
The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.

Code:
  encryptStream(key, stream) {
    const output = new PassThrough();
    const bIv = this.getIv();

    const aes = createCipheriv(this.algo, key, bIv);

    output.write(bIv);
    stream.pipe(aes).pipe(output);

    return output;
  }