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Vulnerability record · CVE-2017-11424 · published 24 August 2017

CVE-2017-11424: Pyjwt project pyjwt vulnerability

Pyjwt Project · Pyjwt

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.

7.5 CVSS 3.0 High EPSS 1.8% · top 22.3%
7.5CVSS 3.0 base score, v2 5.0
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.debian.org/security/2017/dsa-3979 Third Party Advisory
https://github.com/jpadilla/pyjwt/pull/277 Issue TrackingPatchThird Party Advisory
http://www.debian.org/security/2017/dsa-3979 Third Party Advisory
https://github.com/jpadilla/pyjwt/pull/277 Issue TrackingPatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-11424), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.