Vulnerability	Vulnerable Version
H Inefficient Algorithmic Complexity Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the `JWK.import_key()` method, whose `key_ops` duplicate detection rescans the whole array for every element and enforces no size limit, making the check O(n^2) over untrusted parsed JWK data. An attacker can occupy a CPU core for minutes with a sub-megabyte request body, and exhaust a server with a handful of concurrent requests, by submitting a key such as `{"kty":"oct","k":"AAAA","key_ops":[...]}` carrying roughly 50,000 distinct operations. This requires the application to import attacker-supplied JWK or JWK Sets through `import_key()` or the related `from_json()` and `import_keyset()` entry points, as in dynamic client registration, DPoP, ACME account keys, or federated JWKS endpoints, and relying parties that import keys only from fixed trusted issuers are unexposed. How to fix Inefficient Algorithmic Complexity? Upgrade `jwcrypto` to version 1.6.1 or higher.	[,1.6.1)

Inefficient Algorithmic Complexity

Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the JWK.import_key() method, whose key_ops duplicate detection rescans the whole array for every element and enforces no size limit, making the check O(n^2) over untrusted parsed JWK data. An attacker can occupy a CPU core for minutes with a sub-megabyte request body, and exhaust a server with a handful of concurrent requests, by submitting a key such as {"kty":"oct","k":"AAAA","key_ops":[...]} carrying roughly 50,000 distinct operations. This requires the application to import attacker-supplied JWK or JWK Sets through import_key() or the related from_json() and import_keyset() entry points, as in dynamic client registration, DPoP, ACME account keys, or federated JWKS endpoints, and relying parties that import keys only from fixed trusted issuers are unexposed.

How to fix Inefficient Algorithmic Complexity?

Upgrade jwcrypto to version 1.6.1 or higher.

[,1.6.1)

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