What is CVE-2026-7531?

CVE-2026-7531 is a critical-severity vulnerability in Wolfssl, classified under Use After Free. CVSS score: 9.8/10. Published 2026-06-25.

How severe is CVE-2026-7531?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Wolfssl

CVE-2026-7531

Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-2026-5460 (released in 5.9.1): a malicious TLS 1.3 server sending a truncated PQC hybrid KeyShare can still trigger the error cleanup path to opera…

Vulnerability class: Use-After-Free

EPSS: 0.003 (27.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Wolfssl — versions 5.8.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-7531?: CVE-2026-7531 is a critical-severity vulnerability in Wolfssl, classified under Use After Free. CVSS score: 9.8/10. Published 2026-06-25.
How severe is CVE-2026-7531?: Critical severity. CVSS v3 base score is 9.8 out of 10.