{"id":"AZL-93042","summary":"CVE-2026-48525 affecting package python-jwt for versions less than 2.13.0-1","details":"PyJWT is a JSON Web Token implementation in Python. From 2.8.0 to 2.12.1, when verifying detached JWS tokens using the unencoded-payload option (\"b64\": false, RFC 7797), PyJWT performs Base64URL decoding of the compact-serialization payload segment before enforcing the detached-payload rules. For b64=false, PyJWT later discards that decoded payload and replaces it with the caller-provided detached_payload. In practice, this turns the middle segment into an attacker-controlled “work amplifier”: a remote client can supply an arbitrarily large Base64URL payload segment that forces CPU work + memory allocations even if the signature is invalid. This creates an unauthenticated DoS vector against any endpoint that verifies detached JWS using PyJWT. This vulnerability is fixed in 2.13.0.","modified":"2026-08-28T17:47:36.368314938Z","published":"2026-05-28T16:16:29Z","upstream":["CVE-2026-48525"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48525"}],"affected":[{"package":{"name":"python-jwt","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-jwt"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.13.0-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-93042.json"}}],"schema_version":"1.9.0"}