High 7.4Published May 28, 2026

CVE-2026-48526PyJWT: Public-key JWK accepted as HMAC secret enables forged HS256 tokens when mixed families are allowed

Updated under an hour ago (Oct 27, 2026, 12:10 PM ET)

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It affects jpadilla pyjwt and 17 other products. Add what you run to find out whether that includes you.

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Every CVE for jpadilla pyjwt

Exploited in the last 30 days

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

CVSS: 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-287, CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

jpadilla pyjwt jpadilla:pyjwt (from the name)	before 2.13.0	CNA record
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 redhat:ansible_automation_platform	from 0:4.6.31-1.el8ap not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:4.16.0-21.el10_2.2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:4.16.0-5.el10_0.11 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions redhat:rhel_e4s	from 0:4.10.0-43.el9_2.23 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus	from 0:4.10.0-86.el9_6.18 not affected	CISA ADP
Red Hat Red Hat Satellite 6.16 for RHEL 8 redhat:satellite	from 0:2.13.0-1.el8pc not affected	CISA ADP
Red Hat Red Hat Satellite 6.16 for RHEL 8 redhat:satellite_capsule	from 0:2.13.0-1.el8pc not affected	CISA ADP
Red Hat Red Hat AI Inference Server 3.3 redhat:ai_inference_server	from 1782353093 not affected	CISA ADP
Red Hat Red Hat Migration Toolkit for Applications 8.2 redhat:migration_toolkit_applications	from 1784109883 not affected	CISA ADP
1–10 of 18

References

References

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx	x-refsource-confirm, exploit, vendor-advisory
https://access.redhat.com/errata/RHSA-2026:25902
https://access.redhat.com/errata/RHSA-2026:25928
https://access.redhat.com/errata/RHSA-2026:26206
https://access.redhat.com/errata/RHSA-2026:28571
https://access.redhat.com/errata/RHSA-2026:30076
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/errata/RHSA-2026:33683
https://access.redhat.com/errata/RHSA-2026:34160
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.