by Kastro
Paper/Archive/CVE-2026-102267

CVE-2026-102267

jpadilla pyjwt — PyJWT: PyJWKClient follows redirects when fetching JWKS

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
28
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 5.0.050 × 201.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
pyjwt< 2.14.0–CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
GitHub_M (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/jpadilla/pyjwt/security/advisories/GHSA-9v7f-9g4p-ffgjrefgithub.com/jpadilla/pyjwt/commit/0a795b8e1f6ef08f634aa7086fc41cc6d5ce3e56refgithub.com/jpadilla/pyjwt/releases/tag/2.14.0