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3.7 Low

CVE-2026-48524 PyJWT is a JSON Web Token implementation in Python

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 products and versions

Product Affected versions Fixed in
pyjwt 2.13 earliest → < 2.13.0 2.13.0

References

Timeline

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Other CVEs of pyjwt

The 22 CVEs of pyjwt →
CVE-2026-103001 PyJWT is a Python implementation of JSON Web Token standards 6.5 Medium CVE-2026-102265 PyJWT is a Python implementation of JSON Web Token standards 5.3 Medium CVE-2026-102275 PyJWT is a Python implementation of JSON Web Token standards 6.5 Medium CVE-2026-102274 PyJWT is a Python implementation of JSON Web Token standards 5.9 Medium
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