What is CVE-2026-48990?

CVE-2026-48990 is a medium-severity vulnerability in Authlib Joserfc, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-06-17.

How severe is CVE-2026-48990?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Authlib Joserfc

CVE-2026-48990

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegis…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Authlib Joserfc — versions < 1.6.7

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption
CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-48990?: CVE-2026-48990 is a medium-severity vulnerability in Authlib Joserfc, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-06-17.
How severe is CVE-2026-48990?: Medium severity. CVSS v3 base score is 5.3 out of 10.