VulnerabilityModified
CVE-2026-32597
This vulnerability is fixed in 2.12.0.
HIGH 7.5EPSS 0.27%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.27% probability · 19th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345, CWE-863, CWE-347
- Affected
- pyjwt project/pyjwt
- Source
- security-advisories@github.com
References
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9fExploit, 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
- https://access.redhat.com/errata/RHSA-2026:13672
- https://access.redhat.com/errata/RHSA-2026:13916
- https://access.redhat.com/errata/RHSA-2026:17083
- https://access.redhat.com/errata/RHSA-2026:19138
- https://access.redhat.com/errata/RHSA-2026:19355
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:21431
- https://access.redhat.com/errata/RHSA-2026:21517
- https://access.redhat.com/errata/RHSA-2026:22330
- https://access.redhat.com/errata/RHSA-2026:24977
- https://access.redhat.com/errata/RHSA-2026:26226
- https://access.redhat.com/errata/RHSA-2026:37275
- https://access.redhat.com/errata/RHSA-2026:42644
- https://access.redhat.com/errata/RHSA-2026:6568
- https://access.redhat.com/errata/RHSA-2026:6720
- https://access.redhat.com/errata/RHSA-2026:6912
- https://access.redhat.com/errata/RHSA-2026:6926
- https://access.redhat.com/errata/RHSA-2026:8437
- https://access.redhat.com/errata/RHSA-2026:8746
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.