CVE-2026-48524
Last modified
CVE-2026-48524 is a low-severity vulnerability rated 3.7/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Pyjwt Project | Pyjwt | < 2.13.0 |
References
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-fhv5-28vv-h8m8Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-48524?
How severe is CVE-2026-48524?
How do I fix CVE-2026-48524?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-48518MultiJuicer is used to run separate Juice Shop instances on …4.3
- CVE-2026-48519Langflow is a tool for building and deploying AI-powered age…9.6
- CVE-2026-4852The Image Source Control Lite – Show Image Credits and Capti…6.4
- CVE-2026-48520Langflow is a tool for building and deploying AI-powered age…6.1
- CVE-2026-48522PyJWT is a JSON Web Token implementation in Python. Prior to…4.2
- CVE-2026-48523PyJWT is a JSON Web Token implementation in Python. From 2.9…5.4
- CVE-2026-48525PyJWT is a JSON Web Token implementation in Python. From 2.8…5.3
- CVE-2026-48526PyJWT is a JSON Web Token implementation in Python. Prior to…7.4
- CVE-2026-48527HAX CMS helps manage microsite universe with PHP or NodeJs b…8.7
- CVE-2026-48529GitHub MCP Server is GitHub's official MCP Server. From 0.22…6
- CVE-2026-4853The JetBackup – Backup, Restore & Migrate plugin for WordPre…4.9
- CVE-2026-48530GFI Archiver before 15.13 contains a stored cross-site scrip…5.4
Are you affected by CVE-2026-48524?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST