Vulnerability Details 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 it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 4.7%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-32597
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cpe:2.3:a:pyjwt_project:pyjwt:0.1.6
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cpe:2.3:a:pyjwt_project:pyjwt:0.1.9
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cpe:2.3:a:pyjwt_project:pyjwt:0.2.0
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cpe:2.3:a:pyjwt_project:pyjwt:0.2.2
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cpe:2.3:a:pyjwt_project:pyjwt:0.2.3
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cpe:2.3:a:pyjwt_project:pyjwt:0.3.0
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cpe:2.3:a:pyjwt_project:pyjwt:0.3.1
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cpe:2.3:a:pyjwt_project:pyjwt:0.3.2
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cpe:2.3:a:pyjwt_project:pyjwt:0.4.0
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cpe:2.3:a:pyjwt_project:pyjwt:0.4.1
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cpe:2.3:a:pyjwt_project:pyjwt:0.4.2
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cpe:2.3:a:pyjwt_project:pyjwt:0.4.3
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cpe:2.3:a:pyjwt_project:pyjwt:1.0.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.0.1
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cpe:2.3:a:pyjwt_project:pyjwt:1.1.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.2.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.3.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.4.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.4.1
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cpe:2.3:a:pyjwt_project:pyjwt:1.4.2
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cpe:2.3:a:pyjwt_project:pyjwt:1.5.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.5.1
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cpe:2.3:a:pyjwt_project:pyjwt:1.5.2
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cpe:2.3:a:pyjwt_project:pyjwt:1.5.3
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cpe:2.3:a:pyjwt_project:pyjwt:1.6.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.6.1
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cpe:2.3:a:pyjwt_project:pyjwt:1.6.3
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cpe:2.3:a:pyjwt_project:pyjwt:1.6.4
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cpe:2.3:a:pyjwt_project:pyjwt:1.7.0
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cpe:2.3:a:pyjwt_project:pyjwt:1.7.1
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cpe:2.3:a:pyjwt_project:pyjwt:2.0.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.0.1
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cpe:2.3:a:pyjwt_project:pyjwt:2.1.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.2.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.3.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.4.0