High 7.5Published Mar 12, 2026

CVE-2026-32597PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

Updated under an hour ago (Oct 26, 2026, 8:23 PM ET)

Does this affect you?

It affects jpadilla pyjwt and 13 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for jpadilla pyjwt

Exploited in the last 30 days

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-345, CWE-863, 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 2.12.0	CNA record
Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 redhat:ansible_automation_platform	from 0:4.6.28-3.el8ap not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:4.16.0-13.el10_1.4 not affected; from 0:4.16.0-21.el10_2.1 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_0.9 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_2.21 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus	from 0:4.10.0-62.el9_4.24 not affected	CISA ADP
Red Hat Red Hat AI Inference Server 3.3 redhat:ai_inference_server	from 1775680192 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux AI 3.3 redhat:enterprise_linux_ai	from 1776871984 not affected	CISA ADP
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1776338381 not affected	CISA ADP
Red Hat Red Hat Quay 3.10 redhat:quay	from 1775169155 not affected	CISA ADP
1–10 of 14

References

References

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://lists.debian.org/debian-lts-announce/2026/05/msg00008.html
https://access.redhat.com/errata/RHSA-2026:10140
https://access.redhat.com/errata/RHSA-2026:10141
https://access.redhat.com/errata/RHSA-2026:10184
https://access.redhat.com/errata/RHSA-2026:12176
https://access.redhat.com/errata/RHSA-2026:13508
https://access.redhat.com/errata/RHSA-2026:13512
https://access.redhat.com/errata/RHSA-2026:13545
https://access.redhat.com/errata/RHSA-2026:13553
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.