{"id":"AZL-105221","summary":"CVE-2026-102271 affecting package python-jwt 2.13.0-1","details":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","modified":"2026-10-03T05:35:10Z","published":"2026-09-28T21:17:15Z","upstream":["CVE-2026-102271"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102271"}],"affected":[{"package":{"name":"python-jwt","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-jwt"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.13.0-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-105221.json"}}],"schema_version":"1.9.0"}