Access of Resource Using Incompatible Type ('Type Confusion') Affecting jsonwebtoken package, versions <10.3.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Feb 2026
- disclosed3 Feb 2026
- creditKrishna Agarwal
Introduced: 3 Feb 2026
CVE-2026-25537 (opens in a new tab)How to fix?
Upgrade jsonwebtoken to version 10.3.0 or higher.
Overview
Affected versions of this package are vulnerable to Access of Resource Using Incompatible Type ('Type Confusion') via the claim validation logic. An attacker can bypass time-based access restrictions by providing claims such as nbf or exp with incorrect JSON types, causing the validation logic to skip checks and grant unauthorized access.
Note:
This is only exploitable if validation flags (like validate_nbf or validate_exp) are enabled without adding the respective claims to the required claims list.