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.

The version of python-jwcrypto installed on the remote host is prior to 0.4.2-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3968 advisory.

    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. (CVE-2026-92091)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-3158 advisory.

    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. (CVE-2026-92091)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-92091)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
365269	Amazon Linux 2 : python-jwcrypto (ALAS-2026-3968)	Nessus	Amazon Linux Local Security Checks	Local	medium
365257	Amazon Linux 2023 : python3-jwcrypto (ALAS2023-2026-3158)	Nessus	Amazon Linux Local Security Checks	Local	medium
349301	Linux Distros Unpatched Vulnerability : CVE-2026-92091	Nessus	Misc.	Local	medium

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CVE-2026-92091

medium

Tenable Plugins

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medium

medium