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I. Basic Information for CVE-2026-32597
Vulnerability Information
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Vulnerability Title
PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对数据真实性的验证不充分
Source: NVD (National Vulnerability Database)
Vulnerability Title
pyjwt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pyjwt是美国José Padilla个人开发者的一个 Python 库。允许对 JSON Web 令牌（JWT）进行编码和解码。 pyjwt存在安全漏洞，该漏洞源于未验证crit关键标头参数，可能导致接受包含未知扩展的JWS令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
jpadillapyjwt < 2.12.0 -
II. Public POCs for CVE-2026-32597
#POC DescriptionSource LinkShenlong Link
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kimi-k2.5 · 6802 chars
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III. Intelligence Information for CVE-2026-32597
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IV. Related Vulnerabilities
Same product: pyjwt
Same vendor: jpadilla
Same weakness: CWE-345
V. Comments for CVE-2026-32597

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