# CVE-2026-48524: python3-jwt: PyJWT is a JSON Web Token implementation in Python

CVE-2026-48524 is fixed in 3 products on 1 platform, first by python3-jwt 2.7.0-1ubuntu0.2, released May 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-48524
- Priority: Routine
- CVSS: 3.7 (Medium)
- EPSS: 0.0040
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 28, 2026

## Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient.get_signing_key() forces a fresh HTTP request to the JWKS endpoint for every JWT with an unknown kid value, with no rate limiting. Since kid comes from the unverified token header, an attacker can trigger unlimited outbound requests. The vulnerability surfaces only when a JWKS fetch fails; an attacker can attempt to provoke that with sustained unknown-kid traffic, but the outcome depends on upstream JWKS-endpoint behavior (rate limiting, transient errors) which is beyond the attacker's control. This vulnerability is fixed in 2.13.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pyjwt Debian 14 | 2.13.0-1 | [DEBIAN-CVE-2026-48524](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48524.md) | May 28, 2026 |
| Linux | python-PyJWT opensuse-leap 16.0 | 2.12.1-160000.2.1 | [OPENSUSE-SU-2026:21095-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21095-1.md) | Jun 19, 2026 |
| Linux | python-PyJWT sles 15.6 | 2.8.0-150400.8.13.1 | [SUSE-SU-2026:2626-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2626-1.md) | Jun 25, 2026 |
| Linux | python-PyJWT sles 15.7 | 2.8.0-150400.8.13.1 | [SUSE-SU-2026:2626-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2626-1.md) | Jun 25, 2026 |
| Linux | python-PyJWT sles 16.0 | 2.12.1-160000.2.1 | [SUSE-SU-2026:22170-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22170-1.md) | Jun 19, 2026 |
| Linux | python3-jwt Ubuntu 24.04.5 LTS (noble) | 2.7.0-1ubuntu0.2 | [python3-jwt 2.7.0-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-jwt-2.7.0-1ubuntu0.2.md) | May 28, 2026 |
| Linux | python3-jwt Ubuntu 26.04.1 LTS (resolute) | 2.10.1-4ubuntu1.1 | [python3-jwt 2.10.1-4ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-jwt-2.10.1-4ubuntu1.1.md) | May 28, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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