pyjwt: PyJWT is a JSON Web Token implementation in Python
CVE-2026-48523 is fixed in 3 products on 1 platform, first by python3-jwt 2.10.1-4ubuntu1.1, released May 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.
PyJWT is a JSON Web Token implementation in Python. From 2.9.0 to 2.12.1, there is a verifier-side algorithm allow-list bypass when jwt.decode() or jwt.decode_complete() are called with a PyJWK key. The token header alg is checked against the caller-supplied algorithms allow-list, but signature verification is performed with the algorithm bound to the PyJWK object instead of the header algorithm. An attacker who controls a registered JWK/JWKS private key can sign with a disallowed algorithm, advertise an allowed algorithm in the JWT header, and still be accepted. The issue affects the documented PyJWKClient.get_signing_key_from_jwt(...) flow. 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-2026-48523 | 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 | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1 | Jun 25, 2026 |
| python-PyJWT · sles 15.7 | 2.4.0-150200.3.14.1 | SUSE-SU-2026:2627-1 | 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 26.04.1 LTS (resolute) | 2.10.1-4ubuntu1.1 | python3-jwt 2.10.1-4ubuntu1.1 | May 28, 2026 |
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