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CVE-2026-102267PyJWT: PyJWKClient follows redirects when fetching JWKS

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.

9.1 CRITICALEPSS 0.15%Not in KEVNVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.1CRITICAL3.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.4HIGH3.1GitHub_M (CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CVE ID
CVE-2026-102267
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
Sep 28, 2026
Last modified
2026-10-07 20:27 UTC
Weaknesses
  • CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-345 · Insufficient Verification of Data Authenticity
  • CWE-918 · Server-Side Request Forgery (SSRF)

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:45 UTC.