I created this private key using node-jose, and then when I load it back into node jose using the asKey function, I get an error;

RangeError: Attempt to access memory outside buffer bounds

const privatePem = `-----BEGIN EC PRIVATE KEY-----
MHcCAQEEIOeCAAAgHeSEY/fn0OYjJh49LKmVReGQmJcQx78u0sVCoAoGCCqGSM49
AwEHoUQDQgAEPwrrzWtZSsEb6EgldGFCnqbykydVPbvtP3H1UKs6EPDCl8mzGMHg
kksAw85JhXLAhy7b4WP0clQCXMDvJGanqg==
-----END EC PRIVATE KEY-----`;

await nodeJose.JWK.asKey(privatePem, 'pem');

This doesn't always happen, more often than not a private key is generated that works completely correctly.

The private key looks valid when I use the command

openssl ec -in broken-pem.pem -noout -text to validate it.

I'm on node v16.14.2 but i've tried it on a lot of different node versions using runkit, and using version 2.2.0 of node-jose.

I'm generating the keys using;

  const key = await jose.JWK.createKey('EC', 'P-256', { alg: '' });

  const privatePem = key.toPEM(true);
  const publicPem = key.toPEM(false);

which creates keys that work 99% of the time.

With the broken key

With a valid key generated in the same way;

This can happen for both public and private keys.