Wolfssl Wolfssl — CVE-2026-7531 (Critical)

Date Jun 25, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Wolfssl · Wolfssl

CVE CVE-2026-7531

Critical vendor advisory CVE-2026-7531

Summary

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 operate on freed memory.

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 9.8) in Wolfssl Wolfssl. Patch or mitigate promptly. EPSS percentile: 20%.

Operator check

Review CVE-2026-7531 in your asset inventory. Apply patches per vendor guidance and verify Wolfssl is not exposed. CVSS score: 9.8. EPSS probability: 0.3%; percentile: 20%.

Sources

NVD — CVE-2026-7531 Source reference Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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