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CVE-2026-102269

nvd nist
Published: Sep 28, 2026Modified: Oct 6, 2026

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5.4
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Exploitability: 2.8 / Impact: 2.5
Source: NVD

Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT signature segment is affected because signature segment decoding accepts characters outside the canonical Base64URL representation. This occurs when non-Base64URL characters are appended to a valid compact JWS signature segment. As a result, base64url_decode produces the same signature bytes for different serialized segments. Consequently, raw-token revocation checks can fail to recognize an equivalent modified token. This issue is fixed in version 2.14.0.

Affected (1)

Products: Pyjwt Project: Pyjwt
Pyjwt Project
1 product
Pyjwt
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Pyjwt
version < 2.14.0

Related CWEs

CWE-180
Incorrect Behavior Order: Validate Before Canonicalize
The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step.

References (3)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
ProductRelease Notes
Source: security-advisories@github.com
ExploitMitigationVendor Advisory

Timeline

No history available yet.