PYSEC-2026-4183
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pyjwt/PYSEC-2026-4183.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-4183
- Aliases
- Published
- 2026-09-28T21:17:15Z
- Modified
- 2026-10-07T10:00:03Z
- Severity
-
- 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
PyJWT is a Python implementation of JSON Web Token standards. From 2.1.0 until 2.15.0, PyJWT OKPAlgorithm.from_jwk in jwt/algorithms.py is affected because private-JWK import path does not compare the public key derived from d with x. This occurs when an OKP private JWK supplies non-corresponding x and d components. As a result, identity derived from x can differ from operations performed with d. Consequently, if an integration also accepts private key parameters from a proof header without rejecting them, an attacker may use a stolen sender-constrained token without the legitimate private key. This issue is fixed in version 2.15.0.
- References
Affected packages
PyPI / pyjwt
Package
- Name
- pyjwt
- View open source insights on deps.dev
- Purl
- pkg:pypi/pyjwt