CVE-2026-32597
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability21. percentile0.3%
ProductPyjwt
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-345CWE-345CWE-863Incorrect authorization
How to fix
Update
- pyjwt_project pyjwt2.12.0 or later
- pyjwt2.12.0 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:13512
- access.redhat.com/errata/RHSA-2026:13508
- access.redhat.com/errata/RHSA-2026:17083
- access.redhat.com/errata/RHSA-2026:13916
- access.redhat.com/errata/RHSA-2026:19138
- access.redhat.com/errata/RHSA-2026:12176
- access.redhat.com/errata/RHSA-2026:22330
- access.redhat.com/errata/RHSA-2026:21517
- access.redhat.com/errata/RHSA-2026:21431
- access.redhat.com/errata/RHSA-2026:13672
- access.redhat.com/errata/RHSA-2026:19355
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pyjwt_project pyjwt | v < 2.12.0 | 2.12.0 |
| pyjwtPyPI | v < 2.12.0 | 2.12.0 |
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