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CVE-2017-11424 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/jpadilla/pyjwt/pull/277	CVE	Issue TrackingPatchThird Party Advisory
http://www.debian.org/security/2017/dsa-3979	CVE	Third Party Advisory
https://github.com/jpadilla/pyjwt/pull/277	[email protected]	Issue TrackingPatchThird Party Advisory
http://www.debian.org/security/2017/dsa-3979	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-noinfo	Insufficient Information to Classify Weakness	[email protected]

Affected Products

Product	Versions
pyjwt project pyjwt	<= 1.5.0
CPE cpe:2.3:a:pyjwt_project:pyjwt:::::::: Remediation No remediation found in references.
debian debian linux	8.0 9.0
CPE cpe:2.3:o:debian:debian_linux:8.0:::::::* cpe:2.3:o:debian:debian_linux:9.0:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
May 13, 2026	CVE Status Change	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Oct 3, 2019	CWE Remap	[email protected]
May 10, 2019	Modified Analysis	[email protected]
Nov 4, 2017	CVE Modified	[email protected]
Sep 8, 2017	Initial Analysis	[email protected]