# CVE-2026-101917: PyJWT: PyJWKClient still amplifies unauthenticated JWKS fetches on unknown kid values (incomplete fix of CVE-2026-48524)

CVE-2026-101917 is fixed in 4 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.3, released September 28, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-101917
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0043
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026
- Weakness: Allocation of Resources Without Limits or Throttling
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-101917

## Description

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT get_signing_key_from_jwt is affected because unknown kid misses force refreshes without a negative cache or minimum refresh interval. This occurs when unauthenticated tokens repeatedly use the same unknown kid or varying kid values absent from the cached JWKS. As a result, each cache miss causes PyJWKClient to refresh the JWKS. Consequently, attacker traffic can amplify outbound requests to the configured JWKS endpoint. This issue is fixed in version 2.14.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pyjwt Debian 14 | 2.14.0-1 | [DEBIAN-CVE-2026-101917](https://patchblox.com/security/data/fix/linux/debian-cve-2026-101917.md) | Oct 4, 2026 |
| Linux | python-PyJWT opensuse-leap 16.0 | 2.12.1-160000.3.1 | [OPENSUSE-SU-2026:22074-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22074-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 15.6 | 2.8.0-150400.8.20.1 | [SUSE-SU-2026:5064-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5064-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 15.7 | 2.8.0-150400.8.20.1 | [SUSE-SU-2026:5064-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5064-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 16.0 | 2.12.1-160000.3.1 | [SUSE-SU-2026:24219-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24219-1.md) | Nov 7, 2026 |
| Linux | python3-jwt Ubuntu 22.04.1 LTS (jammy) | 2.3.0-1ubuntu0.6 | [python3-jwt 2.3.0-1ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-jwt-2.3.0-1ubuntu0.6.md) | Oct 27, 2026 |
| Linux | python3-jwt Ubuntu 24.04.5 LTS (noble) | 2.7.0-1ubuntu0.4 | [python3-jwt 2.7.0-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-jwt-2.7.0-1ubuntu0.4.md) | Oct 27, 2026 |
| Linux | python3-jwt Ubuntu 26.04.1 LTS (resolute) | 2.10.1-4ubuntu1.3 | [python3-jwt 2.10.1-4ubuntu1.3](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-jwt-2.10.1-4ubuntu1.3.md) | Sep 28, 2026 |
| Linux | python3-jwt amzn 2023 | 2.4.0-1.amzn2023.0.6 | [ALAS2023-2026-3298](https://patchblox.com/security/data/fix/linux/alas2023-2026-3298.md) | Nov 7, 2026 |
| Linux | python3-jwt+crypto amzn 2023 | 2.4.0-1.amzn2023.0.6 | [ALAS2023-2026-3298](https://patchblox.com/security/data/fix/linux/alas2023-2026-3298.md) | Nov 7, 2026 |

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Data as of 2026-11-09T01:18:40Z 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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