# Fast-Jwt vulnerabilities

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

Junglewise Threat Intelligence has tracked 5 vulnerabilities in Fast-Jwt: 0 in the last 7 days and 5 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-107724, was published on 8 October 2026. Nothing in the last four weeks, down from 5 vulnerabilities in the four before. 0 critical against 1.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 5
- All time: 5 (1 critical, 0 exploited in the wild)

## About Fast-Jwt

JavaScript library for signing and verifying JSON Web Tokens.

## Latest Fast-Jwt vulnerabilities

- [CVE-2026-107724: fast-jwt JWK JSON HMAC secret misclassification in HS256 verification](https://junglewise.ai/threats/cve-2026-107724-fast-jwt-treats-raw-public-jwk-json-as-an-hmac-secret-enabling) (high, CVSS 7.4, published 8 Oct 2026)
- [CVE-2026-107723: fast-jwt claim-validator bypass with JSON array payload](https://junglewise.ai/threats/cve-2026-107723-fast-jwt-silent-claim-validator-bypass-when-jwt-payload-is-a) (high, CVSS 8.1, published 8 Oct 2026)
- [CVE-2026-107722: fast-jwt incomplete RSA-to-HS256 algorithm confusion fix](https://junglewise.ai/threats/cve-2026-107722-fast-jwt-incomplete-patch-of-non-whitespace-key-prefix-re) (critical, CVSS 9.8, published 8 Oct 2026)
- [CVE-2026-107721: fast-jwt clockTolerance validation bypass in expiry and not-before checks](https://junglewise.ai/threats/cve-2026-107721-fast-jwt-clocktolerance-infinity-silently-bypasses-both-exp-and) (medium, CVSS 5.9, published 8 Oct 2026)
- [CVE-2026-107719: fast-jwt expiration bypass in token caching](https://junglewise.ai/threats/cve-2026-107719-fast-jwt-verifier-cache-accepts-expired-jwts-without-iat) (medium, CVSS 4.2, published 8 Oct 2026)

## Most severe Fast-Jwt vulnerabilities

- [CVE-2026-107722: fast-jwt incomplete RSA-to-HS256 algorithm confusion fix](https://junglewise.ai/threats/cve-2026-107722-fast-jwt-incomplete-patch-of-non-whitespace-key-prefix-re) (critical, CVSS 9.8, published 8 Oct 2026)
- [CVE-2026-107723: fast-jwt claim-validator bypass with JSON array payload](https://junglewise.ai/threats/cve-2026-107723-fast-jwt-silent-claim-validator-bypass-when-jwt-payload-is-a) (high, CVSS 8.1, published 8 Oct 2026)
- [CVE-2026-107724: fast-jwt JWK JSON HMAC secret misclassification in HS256 verification](https://junglewise.ai/threats/cve-2026-107724-fast-jwt-treats-raw-public-jwk-json-as-an-hmac-secret-enabling) (high, CVSS 7.4, published 8 Oct 2026)
- [CVE-2026-107721: fast-jwt clockTolerance validation bypass in expiry and not-before checks](https://junglewise.ai/threats/cve-2026-107721-fast-jwt-clocktolerance-infinity-silently-bypasses-both-exp-and) (medium, CVSS 5.9, published 8 Oct 2026)
- [CVE-2026-107719: fast-jwt expiration bypass in token caching](https://junglewise.ai/threats/cve-2026-107719-fast-jwt-verifier-cache-accepts-expired-jwts-without-iat) (medium, CVSS 4.2, published 8 Oct 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 5 vulnerabilities in the four before. 0 critical against 1.

| 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 | 0 | 0 | 0 |
| 5 Oct 2026 | 5 | 1 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## 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, "Fast-Jwt vulnerabilities", https://junglewise.ai/threats/technologies/fast-jwt-fast-jwt, 9 November 2026.