PyJWT accepts public JWK containers as HMAC secrets

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• PyJWT 2.14.0Fixed version · GitHub Advisories · pip package PyJWT: upgrade to 2.14.0 or later (affected = 2.13.0)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• BSI CERT-Bund21 Oct 2026WID-SEC-2026-4111

  Red Hat Ansible Automation Platform: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-11332CVE-2026-102938CVE-2026-103262+21 more CVEs
• CERT-FR2 Oct 2026CERTFR-2026-AVI-1249

  Multiple vulnerabilities in VMware products Translated from French

  Multiple vulnerabilities have been discovered in VMware products. They allow an attacker to cause a security problem not specified by the vendor.

  CVE-2026-75595CVE-2026-53910CVE-2026-56404+288 more CVEs

[ Packages ]Affected open-source packages

• PyJWT pipAffected = 2.13.0 · fixed in 2.14.0 · GHSA-w2cx-738m-mc7w

[ References ]References

• github.com/jpadilla/pyjwt/commit/801cd128528c62d9b23fcd161d1a2e1c17982f95Patch
• github.com/jpadilla/pyjwt/releases/tag/2.14.0ProductRelease Notes
• github.com/jpadilla/pyjwt/security/advisories/GHSA-w2cx-738m-mc7wVendor Advisory