PyJWT accepts inconsistent OKP x/d JWKs, causing public/private key identity confusion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102275
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 21:17:15 UTC
Updated2026-09-28 21:17:15 UTC
DescriptionPyJWT 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Problem Types: CWE-345 | CWE-348 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-348 CWE-348: Use of Less Trusted Source

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jpadilla Pyjwt affected >= 2.1.0, < 2.15.0 Not specified

References

ReferenceSourceLinkTags
github.com/jpadilla/pyjwt/releases/tag/2.15.0 [email protected] github.com
github.com/jpadilla/pyjwt/commit/3cd9ceec33ced359decbad75b413ad668ae6332c [email protected] github.com
github.com/jpadilla/pyjwt/security/advisories/GHSA-x33g-cr3x-6449 [email protected] github.com
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