Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-3968
Advisory Released Date: 2026-10-12
Advisory Updated Date: 2026-10-12
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)
Affected Packages:
python-jwcrypto
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update python-jwcrypto or yum update --advisory ALAS2-2026-3968 to update your system.
noarch:
python-jwcrypto-0.4.2-1.amzn2.0.4.noarch
src:
python-jwcrypto-0.4.2-1.amzn2.0.4.src