PYSEC-2026-120
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pyjwt/PYSEC-2026-120.yaml
- JSON Data
- https://api.test.osv.dev/v1/vulns/PYSEC-2026-120
- Aliases
- Published
- 2026-03-13T19:55:09.500Z
- Modified
- 2026-05-20T09:19:15.426301Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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 ยง4.1.11. 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.
- References
Affected packages
PyPI / pyjwt
Package
- Name
- pyjwt
- View open source insights on deps.dev
- Purl
- pkg:pypi/pyjwt
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed2.12.0
Affected versions
0.*
0.1.1
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.2.0
0.2.1
0.2.3
0.3.0
0.3.1
0.3.2
0.4.0
0.4.1
0.4.2
0.4.3
1.*
1.0.0
1.0.1
1.1.0
1.3.0
1.4.0
1.4.1
1.4.2
1.5.0
1.5.1
1.5.2
1.5.3
1.6.0
1.6.1
1.6.3
1.6.4
1.7.0
1.7.1
2.*
2.0.0a1
2.0.0a2
2.0.0
2.0.1
2.1.0
2.2.0
2.3.0
2.4.0
2.5.0
2.6.0
2.7.0
2.8.0
2.9.0
2.10.0
2.10.1
2.11.0