python3-jwt: PyJWT is a JSON Web Token implementation in Python
CVE-2026-48524 is fixed in 3 products on 1 platform, first by python3-jwt 2.7.0-1ubuntu0.2, released May 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| pyjwt · Debian 14 | 2.13.0-1 | DEBIAN-CVE-2026-48524 | May 28, 2026 |
| python-PyJWT · opensuse-leap 16.0 | 2.12.1-160000.2.1 | OPENSUSE-SU-2026:21095-1 | Jun 19, 2026 |
| python-PyJWT · sles 15.6 | 2.8.0-150400.8.13.1 | SUSE-SU-2026:2626-1 | Jun 25, 2026 |
| python-PyJWT · sles 15.7 | 2.8.0-150400.8.13.1 | SUSE-SU-2026:2626-1 | Jun 25, 2026 |
| python-PyJWT · sles 16.0 | 2.12.1-160000.2.1 | SUSE-SU-2026:22170-1 | Jun 19, 2026 |
| python3-jwt · Ubuntu 24.04.5 LTS (noble) | 2.7.0-1ubuntu0.2 | python3-jwt 2.7.0-1ubuntu0.2 | May 28, 2026 |
| python3-jwt · Ubuntu 26.04.1 LTS (resolute) | 2.10.1-4ubuntu1.1 | python3-jwt 2.10.1-4ubuntu1.1 | May 28, 2026 |
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