What is CVE-2026-48523?

CVE-2026-48523 is a medium-severity vulnerability in Jpadilla Pyjwt, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.4/10. Published 2026-05-28.

How severe is CVE-2026-48523?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Jpadilla Pyjwt

CVE-2026-48523

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…

EPSS: 0.000 (2.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Jpadilla Pyjwt — versions >= 2.9.0, < 2.13.0
Pyjwt_project Pyjwt

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-48523?: CVE-2026-48523 is a medium-severity vulnerability in Jpadilla Pyjwt, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.4/10. Published 2026-05-28.
How severe is CVE-2026-48523?: Medium severity. CVSS v3 base score is 5.4 out of 10.