CVE-2017-11424

In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.

• http://www.debian.org/security/2017/dsa-3979Third Party Advisory
• https://github.com/jpadilla/pyjwt/pull/277Issue Tracking, Patch, Third Party Advisory
• http://www.debian.org/security/2017/dsa-3979Third Party Advisory
• https://github.com/jpadilla/pyjwt/pull/277Issue Tracking, Patch, Third Party Advisory

Published

Aug 24, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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