pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

A missing verification step has been discovered in PyJWT. PyJWT does not validate the crit Critical Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This...

CVE-2026-32597

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit Critical Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting...

pyjwt 安全漏洞

pyjwt is a Python library developed by José Padilla from the United States. It allows for the encoding and decoding of JSON Web Tokens JWTs. pyjwt has security vulnerabilities, stemming from the lack of validation for the crit header parameter. This vulnerability may allow the acceptance of JWS...

EUVD-2018-0707

Malware in sbrugna...

Jwtear - Modular Command-Line Tool To Parse, Create And Manipulate JWT Tokens For Hackers

A modular command-line tool to parse, create and manipulate JSON Web TokenJWT tokens for security testing purposes. Features Complete modularity. All commands are plugins. Easy to add new plugins. Support JWS and JWE tokens. Easy interface for plugins. follow the template example Flexible token...

GHSA-W6GV-3R3V-GWGJ keycloak-core vulnerable to timing attacks against JWS token verification

Red Hat Keycloak before version 2.5.1 has an implementation of HMAC verification for JWS tokens that uses a method that runs in non-constant time, potentially leaving the application vulnerable to timing attacks...

keycloak-core vulnerable to timing attacks against JWS token verification

Red Hat Keycloak before version 2.5.1 has an implementation of HMAC verification for JWS tokens that uses a method that runs in non-constant time, potentially leaving the application vulnerable to timing attacks...

CVE-2017-2585

Red Hat Keycloak before version 2.5.1 has an implementation of HMAC verification for JWS tokens that uses a method that runs in non-constant time, potentially leaving the application vulnerable to timing attacks...

CVE-2017-2585

CVE-2017-2585 affects Red Hat Keycloak before version 2.5.1, where JWS token HMAC verification is implemented in non-constant time, potentially enabling timing attacks. Documents across OSV/GHSA/NVD reiterate this exact flaw for Keycloak; no explicit exploit details or affected version ranges bey...

Timing Attacks

keycloak-core is vulnerable to timing attacks. The vulnerability is possible because the HMAC signature comparison algorithm used by its JWS token code is not performed in constant time. Therefore, an attacker can trigger a timing attack through the JWS tokens...