Is CVE-2026-102273 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-102273?

CVE-2026-102273 has a CVSS v3 severity of HIGH (7.4).

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CVE-2026-102273

Description

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. This occurs when an application allows HMAC and asymmetric algorithms and passes a public JWK container as the raw key. As a result, public asymmetric key material is accepted as the HMAC secret. Consequently, an attacker who knows the public key can forge a token with arbitrary authenticated claims. This issue is fixed in version 2.14.0.