# CVE-2024-37568: Authlib has algorithm confusion with asymmetric public keys

Source: https://junglewise.ai/threats/cve-2024-37568-authlib-has-algorithm-confusion-with-asymmetric-public-keys  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-06-09  
License: CC BY 4.0 with a link back

CVE-2024-37568 · Severity: low · CVSS 3.1 · Published 2024-06-09

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.)

Technologies: [authlib (PyPI)](https://junglewise.ai/threats/technologies/authlib). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2024-37568 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-37568 being exploited in the wild.

**How severe is CVE-2024-37568?** Low severity, with a CVSS score of 3.1, published 9 June 2024.

**Which products and versions are affected?** authlib (PyPI) ECOSYSTEM:introduced=0,fixed=1.3.1.

**Is there a fix for CVE-2024-37568?** Yes. authlib (PyPI): upgrade to 1.3.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2024-37568?** Check whether you run authlib (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- authlib (PyPI): upgrade to 1.3.1 or later

  ```sh
  pip install "authlib>=1.3.1"
  ```


## Affected products

- authlib (PyPI) ECOSYSTEM:introduced=0,fixed=1.3.1

## Identifiers

- CVE-2024-37568
- GHSA-5357-c2jx-v7qh
- PYSEC-2024-52

## Related threats

- [Authlib client configuration endpoint authorization bypass](https://junglewise.ai/threats/cve-2026-116672-authlib-is-a-python-library-which-builds-oauth-and-openid)
- [Authlib RFC 9101 server-side request forgery in request_uri parameter](https://junglewise.ai/threats/cve-2026-114620-authlib-is-a-python-library-which-builds-oauth-and-openid)
- [Authlib OpenID Connect scope validation bypass](https://junglewise.ai/threats/cve-2026-114619-authlib-is-a-python-library-which-builds-oauth-and-openid)
- [Authlib JWT Bearer Grant audience validation bypass](https://junglewise.ai/threats/cve-2026-114618-authlib-is-a-python-library-which-builds-oauth-and-openid)
- [Authlib nonce validation bypass in OpenID token parsing](https://junglewise.ai/threats/cve-2026-114617-authlib-is-a-python-library-which-builds-oauth-and-openid)