Bug 2542695 (CVE-2026-102272) - CVE-2026-102272 pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling
Summary: CVE-2026-102272 pyjwt: pyjwt: Token forgery via improper Unicode byte-order m...
Keywords:
Status: NEW
Alias: CVE-2026-102272
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)
115 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-2026:94500 0 None None None 2026-11-03 12:40:43 UTC
Red Hat Product Errata RHSA-2026:94501 0 None None None 2026-11-03 11:52:14 UTC
Red Hat Product Errata RHSA-2026:94523 0 None None None 2026-11-03 13:34:44 UTC
Red Hat Product Errata RHSA-2026:94557 0 None None None 2026-11-03 14:28:30 UTC
Red Hat Product Errata RHSA-2026:94634 0 None None None 2026-11-03 18:54:55 UTC
Red Hat Product Errata RHSA-2026:95012 0 None None None 2026-11-04 06:41:00 UTC
Red Hat Product Errata RHSA-2026:98503 0 None None None 2026-11-11 12:04:52 UTC
Red Hat Product Errata RHSA-2026:98612 0 None None None 2026-11-11 11:35:39 UTC
Red Hat Product Errata RHSA-2026:99949 0 None None None 2026-11-12 23:46:09 UTC
Red Hat Product Errata RHSA-2026:99950 0 None None None 2026-11-12 23:47:24 UTC
Red Hat Product Errata RHSA-2026:99952 0 None None None 2026-11-12 23:48:22 UTC

Description OSIDB Bzimport 2026-09-28 20:52:13 UTC 
PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.
Comment 1 Jon Orris 2026-10-21 13:53:20 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 Jon Orris 2026-11-03 11:52:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:94501 https://access.redhat.com/errata/RHSA-2026:94501
Comment 5 Jon Orris 2026-11-03 12:40:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:94500 https://access.redhat.com/errata/RHSA-2026:94500
Comment 6 Jon Orris 2026-11-03 13:34:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:94523 https://access.redhat.com/errata/RHSA-2026:94523
Comment 7 Jon Orris 2026-11-03 14:28:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:94557 https://access.redhat.com/errata/RHSA-2026:94557
Comment 8 Jon Orris 2026-11-03 18:54:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:94634 https://access.redhat.com/errata/RHSA-2026:94634
Comment 9 Jon Orris 2026-11-04 06:40:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:95012 https://access.redhat.com/errata/RHSA-2026:95012
Comment 10 errata-xmlrpc 2026-11-11 11:35:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:98612 https://access.redhat.com/errata/RHSA-2026:98612
Comment 11 errata-xmlrpc 2026-11-11 12:04:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:98503 https://access.redhat.com/errata/RHSA-2026:98503
Comment 12 errata-xmlrpc 2026-11-12 23:46:02 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 13 errata-xmlrpc 2026-11-12 23:47:17 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 14 errata-xmlrpc 2026-11-12 23:48:16 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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