# JS/TS Security
# Detects weak hash algorithm selection in crypto hashing APIs.
id: ts-weak-hash
name: Weak Hash Primitive
severity: error
category: security
defect_class: injection
inline_tier: blocking
language: typescript

message: "Weak hash primitive selected (md5/sha1) — use sha256+ for security-sensitive contexts"

description: |
  Using MD5/SHA1 in cryptographic hashing contexts is insecure.

  ✅ FIX: use SHA-256 or stronger algorithms.

query: |
  (call_expression
    function: (member_expression
      property: (property_identifier) @FN)
    arguments: (arguments
      (string (string_fragment) @ALG)
      (_)*)
    (#eq? @FN "createHash")
    (#match? @ALG "^(md5|sha1)$"))

metavars:
  - FN
  - ALG

post_filter: ts_weak_hash_algorithm

cwe:
  - CWE-327
owasp:
  - A02
confidence: high

has_fix: false

tags:
  - javascript
  - typescript
  - security
  - crypto
  - weak-hash

examples:
  bad: |
    const hash = crypto.createHash("md5").update(data).digest("hex")

  good: |
    const hash = crypto.createHash("sha256").update(data).digest("hex")