high7.4
CVE-2026-102273
PyJWT is a Python implementation of JSON Web Token standards.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | PyJWT | = 2.13.0 | 2.14.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pyjwt Project | Pyjwt | Version 2.13.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-w2cx-738m-mc7w
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7w
- https://nvd.nist.gov/vuln/detail/CVE-2026-102273
- https://github.com/jpadilla/pyjwt/commit/801cd128528c62d9b23fcd161d1a2e1c17982f95
- https://github.com/jpadilla/pyjwt/releases/tag/2.14.0