Allocation of Resources Without Limits or Throttling Affecting pyjwt package, versions [,2.14.0)
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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Start learning- Snyk IDSNYK-PYTHON-PYJWT-20245196
- published29 Sept 2026
- disclosed28 Sept 2026
- creditKingsley Olukanni
Introduced: 28 Sep 2026
NewCVE-2026-101917 (opens in a new tab)How to fix?
Upgrade pyjwt to version 2.14.0 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via PyJWKClient.get_signing_key in jwt/jwks_client.py, where an attacker can repeatedly present tokens with unknown key IDs, causing the client to perform an unbounded number of forced refreshes against the JWKS endpoint. Each unrecognised kid triggers a fresh HTTP fetch with no rate limiting or cooldown, allowing an attacker to exhaust the server's resources or cause excessive outbound network traffic.