Bug 2542690 (CVE-2026-102267) - CVE-2026-102267 pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects
Summary: CVE-2026-102267 pyjwt: pyjwt: Verification key substitution via unvalidated J...
Keywords:
Status: NEW
Alias: CVE-2026-102267
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-28 20:47 UTC by OSIDB Bzimport
Modified: 2026-09-28 20:53 UTC (History)
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Description OSIDB Bzimport 2026-09-28 20:47:09 UTC 
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.
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