CVE-2017-11424
NONE
Published Aug 24, 20178y ago · Modified Jun 17, 20261w ago
Published Aug 24, 2017 8y ago
Last Modified Jun 17, 2026 1w ago
Description
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.
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
No Known Exploit
Patch Available
Affected Products 3
| Vendor | Product | Version | Range |
|---|---|---|---|
| pyjwt_project | pyjwt | * | ≤1.5.0 |
| debian | debian_linux | 8.0 | any |
| debian | debian_linux | 9.0 | any |
References 2
- debian.org http://www.debian.org/security/2017/dsa-3979
- github.com https://github.com/jpadilla/pyjwt/pull/277
Remediation
- github.com https://github.com/jpadilla/pyjwt/pull/277