What is CVE-2026-55962?

CVE-2026-55962 is a medium-severity vulnerability in Wolfssl, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-06-25.

How severe is CVE-2026-55962?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Wolfssl

CVE-2026-55962

TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client's Finished message without the client having sent a Certificate and CertificateVerify. The post-handshake-auth exemption that allows an empty/absent pee…

Vulnerability class: Broken Authentication

EPSS: 0.001 (4.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Wolfssl — versions 5.5.4

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

facts@wolfssl.com (Patch, patch, Issue Tracking)
facts@wolfssl.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-55962?: CVE-2026-55962 is a medium-severity vulnerability in Wolfssl, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-06-25.
How severe is CVE-2026-55962?: Medium severity. CVSS v3 base score is 6.5 out of 10.