🛡️ CVE-2026-48524
🟢 CVSS 3.7 — Low ✅ No Known Exploit NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Low
CVSS Score 3.7
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-28
Updated 2026-06-15
Modified 2026-06-02
Fix URL N/A

Affected Packages

Software From version Fixed in
pyjwt 2.13.0
unknown

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