Bug 2542697 (CVE-2026-102273) - CVE-2026-102273 pyjwt: pyjwt: Token forgery via acceptance of public JWK containers as HMAC secrets
Summary: CVE-2026-102273 pyjwt: pyjwt: Token forgery via acceptance of public JWK cont...
Keywords:
Status: NEW
Alias: CVE-2026-102273
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-28 20:52 UTC by OSIDB Bzimport
Modified: 2026-11-12 23:48 UTC (History)
110 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:87004 0 None None None 2026-10-21 13:53:27 UTC
Red Hat Product Errata RHSA-2026:99949 0 None None None 2026-11-12 23:46:22 UTC
Red Hat Product Errata RHSA-2026:99950 0 None None None 2026-11-12 23:47:30 UTC
Red Hat Product Errata RHSA-2026:99952 0 None None None 2026-11-12 23:48:29 UTC

Description OSIDB Bzimport 2026-09-28 20:52:38 UTC 
PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.
Comment 1 Jon Orris 2026-10-21 13:53:21 UTC 
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.6 for RHEL 9
  Red Hat Ansible Automation Platform 2.6 for RHEL 10

Via RHSA-2026:87004 https://access.redhat.com/errata/RHSA-2026:87004
Comment 4 errata-xmlrpc 2026-11-12 23:46:15 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 6.16 for RHEL 8
  Red Hat Satellite 6.16 for RHEL 9

Via RHSA-2026:99949 https://access.redhat.com/errata/RHSA-2026:99949
Comment 5 errata-xmlrpc 2026-11-12 23:47:24 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 6.17 for RHEL 9

Via RHSA-2026:99950 https://access.redhat.com/errata/RHSA-2026:99950
Comment 6 errata-xmlrpc 2026-11-12 23:48:22 UTC 
This issue has been addressed in the following products:

  Red Hat Satellite 6.18 for RHEL 9

Via RHSA-2026:99952 https://access.redhat.com/errata/RHSA-2026:99952
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