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Vulnerability record · CVE-2026-102275 · published 28 September 2026

CVE-2026-102275: Pyjwt project pyjwt insufficient verification of data authenticity vulnerability

Pyjwt Project · Pyjwt

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.

8.2 CVSS 3.1 High EPSS 0.14% · top 96.8% CWE-345 · Insufficient verification of data authenticityCWE-348 · CWE-348
8.2CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
6 Oct 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/jpadilla/pyjwt/commit/3cd9ceec33ced359decbad75b413ad668ae6332c Patch
https://github.com/jpadilla/pyjwt/releases/tag/2.15.0 ProductRelease Notes
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-x33g-cr3x-6449 ExploitVendor Advisory
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-x33g-cr3x-6449 ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-102275), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.