jwcrypto Key Import Validation JWK.import_key key_ops resource consumption

Summaryinfo

A vulnerability was found in jwcrypto. It has been classified as problematic. Affected by this vulnerability is the function JWK.import_key of the component Key Import Validation. The manipulation of the argument key_ops leads to resource consumption. This vulnerability is referenced as CVE-2026-92091. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in jwcrypto (unknown version). This issue affects the function JWK.import_key of the component Key Import Validation. The manipulation of the argument key_ops with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

A flaw was found in jwcrypto. The JWK.import_key() function validates the key_ops JWK member for duplicate values using an algorithm with O(n^2) time complexity, and the length of key_ops is not bounded. A remote, unauthenticated attacker can supply a JWK with a large key_ops array to an application that passes attacker-controlled key material to a public key-import API (reachable via ECDH-ES key agreement, OIDC dynamic client registration, DPoP, or ACME account key registration, among others) to consume excessive CPU time, resulting in a denial of service.

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2026-92091 since 09/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• jwcrypto

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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