What is CVE-2026-84185?

CVE-2026-84185 is a medium-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-09-03.

How severe is CVE-2026-84185?

Medium severity. CVSS v3 base score is 5.9 out of 10.

CVE-2026-84185

CVE-2026-84185

A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N.

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

Frequently asked questions

What is CVE-2026-84185?: CVE-2026-84185 is a medium-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-09-03.
How severe is CVE-2026-84185?: Medium severity. CVSS v3 base score is 5.9 out of 10.