Vulnerability Details CVE-2026-102270
PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT is_pem_format is affected because lazy PEM regular expression backtracks extensively. This occurs when a certificate-like input contains repeated BEGIN markers without a matching END marker. As a result, is_pem_format performs unbounded backtracking while searching for a PEM end marker. Consequently, an attacker can cause intensive CPU consumption. This issue is fixed in version 2.14.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 10.7%
CVSS Severity
CVSS v3 Score 4.4
References
Products affected by CVE-2026-102270
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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:2.10.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.10.1
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cpe:2.3:a:pyjwt_project:pyjwt:2.11.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.12.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.12.1
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cpe:2.3:a:pyjwt_project:pyjwt:2.13.0
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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
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cpe:2.3:a:pyjwt_project:pyjwt:2.5.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.6.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.7.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.8.0
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cpe:2.3:a:pyjwt_project:pyjwt:2.9.0