Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🟠 PyJWT, Algorithm Allow-List Bypass, #CVE-2026-48523 (Medium) -DC-Jun2026-426 https://dailycve.com/pyjwt-algorithm-allow-list-bypass-cve-2026-48523-medium-dc-jun2026-426/
Post summary
The post announces a newly disclosed CVE (CVE‑2026‑48523) involving an algorithm allow‑list bypass in PyJWT, rated Medium severity.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | pyjwt_project | pyjwt | - | - | - |