CVE-2026-102267

HIGH 7.4

PyJWT: PyJWKClient follows redirects when fetching JWKS

CVSS Score

7.4

EPSS Score

0.0%

EPSS Percentile

0th

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. This issue is fixed in version 2.14.0.

CWE	CWE-200 CWE-345 CWE-918
Vendor	jpadilla
Product	pyjwt
Published	Sep 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

jpadilla / pyjwt

< 2.14.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/jpadilla/pyjwt/security/advisories/GHSA-9v7f-9g4p-ffgj github.com: https://github.com/jpadilla/pyjwt/commit/0a795b8e1f6ef08f634aa7086fc41cc6d5ce3e56 github.com: https://github.com/jpadilla/pyjwt/releases/tag/2.14.0