Is CVE-2026-102269 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-102269?

CVE-2026-102269 has a CVSS v3 severity of MEDIUM (4.8).

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CVE-2026-102269

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.