---
title: "CVE-2024-33663: python-jose algorithm confusion with OpenSSH ECDSA keys"
url: https://erroneo.us/security/cve/CVE-2024-33663/
description: "CVE-2024-33663 (python-jose (PyPI)): python-jose through 3.3.0 has algorithm confusion with OpenSSH ECDSA keys and other key formats. This is similar to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-04-25
date_modified: 2025-02-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-33663"
kev: false
cvss: 9.3
epss: 0.00307
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-33663: python-jose algorithm confusion with OpenSSH ECDSA keys

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.3% , percentile 22: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 22% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes python-jose (PyPI) < 3.4.0, fixed in 3.4.0 . Check your lockfile, including transitive dependencies.

## What it is

python-jose through 3.3.0 has algorithm confusion with OpenSSH ECDSA keys and other key formats. This is similar to CVE-2022-29217.

## Affected packages

- PyPI `python-jose` < 3.4.0 → fixed: 3.4.0

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 6.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.31% probability of exploitation activity in the next 30 days; percentile 22.

## Sources

- [GitHub Advisory GHSA-6c5p-j8vq-pqhj](https://github.com/advisories/GHSA-6c5p-j8vq-pqhj)
- [CVE.org record CVE-2024-33663](https://www.cve.org/CVERecord?id=CVE-2024-33663)
- [NVD entry CVE-2024-33663](https://nvd.nist.gov/vuln/detail/CVE-2024-33663)
- [github.com](https://github.com/mpdavis/python-jose/issues/346)
- [vicarius.io](https://www.vicarius.io/vsociety/posts/algorithm-confusion-in-python-jose-cve-2024-33663)
- [github.com](https://github.com/pypa/advisory-database/tree/main/vulns/python-jose/PYSEC-2024-232.yaml)

---
Source page: https://erroneo.us/security/cve/CVE-2024-33663/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt