CVEvulnerability

CVE-2026-48524

3.7 LOW Published 2026-05-28 Modified 2026-10-26 Official page ↗
Status
Analyzed
Published
2026-05-28
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.7 LOW — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-460, CWE-755

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.

Affected configurations

• pyjwt project pyjwt (< 2.13.0)

Related

Weakness · CWE (2)

  • CWE-460 Improper Cleanup on Thrown Exception weakness
  • CWE-755 Improper Handling of Exceptional Conditions weakness

References