Excessive Iteration Affecting kelvinmo/simplejwt package, versions <1.1.1
Threat Intelligence
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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- published24 Mar 2026
- disclosed18 Mar 2026
- creditEdoardo Ottavianelli
Introduced: 18 Mar 2026
CVE-2026-33204 (opens in a new tab)How to fix?
Upgrade kelvinmo/simplejwt to version 1.1.1 or higher.
Overview
Affected versions of this package are vulnerable to Excessive Iteration via the decryptKey function when processing attacker-controlled JWE headers using PBES2 algorithms. An attacker can cause excessive CPU consumption and exhaust server resources by supplying a JWE with a very large p2c value, leading to application unavailability.