CVE-2026-102272
Last modified
CVE-2026-102272 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON.
Description
PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| jpadilla | pyjwt | >= 2.13.0, < 2.14.0 |
References
Timeline
- Published
- Last Modified
- Status
- Received
Frequently Asked Questions
What is CVE-2026-102272?
How severe is CVE-2026-102272?
How do I fix CVE-2026-102272?
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- 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-2026-102267PyJWT is a Python implementation of JSON Web Token standards…7.4
- CVE-2026-102268PyJWT is a Python implementation of JSON Web Token standards…9.1
- CVE-2026-102269PyJWT is a Python implementation of JSON Web Token standards…4.8
- CVE-2026-10227A vulnerability has been found in raisulislamg4 student_mana…7.3
- CVE-2026-102270PyJWT is a Python implementation of JSON Web Token standards…4.4
- CVE-2026-102271PyJWT is a Python implementation of JSON Web Token standards…7.4
- CVE-2026-102273PyJWT is a Python implementation of JSON Web Token standards…7.4
- CVE-2026-102274PyJWT is a Python implementation of JSON Web Token standards…5.9
- CVE-2026-102275PyJWT is a Python implementation of JSON Web Token standards…6.5
- CVE-2026-102276The brace-expansion library generates arbitrary strings cont…7.5
- CVE-2026-102277The brace-expansion library generates arbitrary strings cont…5.3
- CVE-2026-102278The brace-expansion library generates arbitrary strings cont…7.5
Are you affected by CVE-2026-102272?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST