← Vulnerability feed

Vulnerability record · CVE-2024-37568 · published 9 June 2024

CVE-2024-37568: Authlib improper verification of cryptographic signature vulnerability

Authlib · Authlib

lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is allowed with any asymmetric public key. (This is similar to CVE-2022-29217 and CVE-2024-33663.)

7.5 CVSS 3.1 High EPSS 0.38% · top 70.4% CWE-347 · Improper verification of cryptographic signatureCWE-284 · Improper access control
7.5CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is allowed with any asymmetric public key. (This is similar to CVE-2022-29217 and CVE-2024-33663.)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

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

References

LinkTags
https://github.com/lepture/authlib/issues/654 ExploitIssue Tracking
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHJI32SN4FNAUVNALVGOKWH
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZI7HYGN7VZAYFV6UV3SRLY
https://www.vicarius.io/vsociety/posts/algorithm-confusion-in-lepture-authlib-cve-2024-37568
https://github.com/lepture/authlib/issues/654 ExploitIssue Tracking
https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHJI32SN4FNAUVNALVGOKWH
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZI7HYGN7VZAYFV6UV3SRLY
https://www.vicarius.io/vsociety/posts/algorithm-confusion-in-lepture-authlib-cve-2024-37568

Track CVE-2024-37568 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-27962Authlib improper verification of cryptographic signature vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's …EPSS 0.52%8.8CVE-2025-68158Authlib cross-site request forgery vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. In versions 1.0.0 through 1.6.5, cache-backed state/request-token storage …EPSS 0.28%8.3CVE-2026-28490Authlib observable discrepancy vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was i…EPSS 0.16%8.2CVE-2026-28498Authlib vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in th…EPSS 0.26%7.7CVE-2026-28802Authlib improper verification of cryptographic signature vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passi…EPSS 0.55%7.5CVE-2025-61920Authlib improper input validation vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JOSE implementation accepts unbounded JW…EPSS 0.64%7.5CVE-2025-59420Authlib insufficient verification of data authenticity vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.4, Authlib’s JWS verification accepts tokens that dec…EPSS 0.26%6.5CVE-2025-62706Authlib uncontrolled resource consumption vulnerabilityAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFL…EPSS 0.46%

Source: NIST National Vulnerability Database (record CVE-2024-37568), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.