# PyJWT vulnerabilities

Source: https://junglewise.ai/threats/vendors/pyjwt  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/pyjwt.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 7 vulnerabilities in PyJWT: 0 in the last 7 days and 7 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, PyJWT HS256/384/512 token forgery via empty HMAC key in oct JWK, was published on 22 October 2026. 1 vulnerability in the last four weeks, down 83% on the four before (6). 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 1
- Last 90 days: 7
- All time: 7 (0 critical, 0 exploited in the wild)

## About PyJWT

Organization or maintainer behind the PyJWT authentication library.

## Latest PyJWT vulnerabilities

- [PyJWT HS256/384/512 token forgery via empty HMAC key in oct JWK](https://junglewise.ai/threats/pyjwt-hs256-384-512-verify-accepts-empty-hmac-key-via-oct-jwk-pyjwk-a3ba63d2) (high, CVSS 7.4, published 22 Oct 2026)
- [CVE-2026-102275: PyJWT OKP algorithm key validation bypass](https://junglewise.ai/threats/cve-2026-102275-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 6.5, published 28 Sep 2026)
- [CVE-2026-102274: PyJWT unhandled ValueError in JWK Set parsing](https://junglewise.ai/threats/cve-2026-102274-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.9, published 28 Sep 2026)
- [CVE-2026-102273: PyJWT HMAC key validation bypass in HMACAlgorithm.prepare_key](https://junglewise.ai/threats/cve-2026-102273-pyjwt-is-a-python-implementation-of-json-web-token-standards) (high, CVSS 7.4, published 28 Sep 2026)
- [CVE-2026-102267: PyJWT open redirect in PyJWKClient JWKS fetches](https://junglewise.ai/threats/cve-2026-102267-pyjwt-is-a-python-implementation-of-json-web-token-standards) (high, CVSS 7.4, published 28 Sep 2026)
- [CVE-2026-102265: PyJWT denial of service via deeply nested token headers](https://junglewise.ai/threats/cve-2026-102265-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.3, published 28 Sep 2026)
- [CVE-2026-101918: PyJWT recursion error denial of service](https://junglewise.ai/threats/cve-2026-101918-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.3, published 28 Sep 2026)

## Most severe PyJWT vulnerabilities

- [CVE-2026-102273: PyJWT HMAC key validation bypass in HMACAlgorithm.prepare_key](https://junglewise.ai/threats/cve-2026-102273-pyjwt-is-a-python-implementation-of-json-web-token-standards) (high, CVSS 7.4, published 28 Sep 2026)
- [CVE-2026-102267: PyJWT open redirect in PyJWKClient JWKS fetches](https://junglewise.ai/threats/cve-2026-102267-pyjwt-is-a-python-implementation-of-json-web-token-standards) (high, CVSS 7.4, published 28 Sep 2026)
- [PyJWT HS256/384/512 token forgery via empty HMAC key in oct JWK](https://junglewise.ai/threats/pyjwt-hs256-384-512-verify-accepts-empty-hmac-key-via-oct-jwk-pyjwk-a3ba63d2) (high, CVSS 7.4, published 22 Oct 2026)
- [CVE-2026-102275: PyJWT OKP algorithm key validation bypass](https://junglewise.ai/threats/cve-2026-102275-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 6.5, published 28 Sep 2026)
- [CVE-2026-102274: PyJWT unhandled ValueError in JWK Set parsing](https://junglewise.ai/threats/cve-2026-102274-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.9, published 28 Sep 2026)
- [CVE-2026-102265: PyJWT denial of service via deeply nested token headers](https://junglewise.ai/threats/cve-2026-102265-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.3, published 28 Sep 2026)
- [CVE-2026-101918: PyJWT recursion error denial of service](https://junglewise.ai/threats/cve-2026-101918-pyjwt-is-a-python-implementation-of-json-web-token-standards) (medium, CVSS 5.3, published 28 Sep 2026)

## Vulnerabilities per week

1 vulnerability in the last four weeks, down 83% on the four before (6).

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 6 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 1 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## PyJWT technologies

- [PyJWT](https://junglewise.ai/threats/technologies/pyjwt-pyjwt): 7 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "PyJWT vulnerabilities", https://junglewise.ai/threats/vendors/pyjwt, 9 November 2026.