CVE-2026-7531

Critical

Description

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.

SeverityCritical

CVSS9.8

Exploit probability—

ProductWolfssl

PublishedJun 25, 2026

First seenJun 25, 2026

Weakness typeCWE-416Use after free

How to fix

Update

wolfssl wolfssl5.9.2 or later

Patches

github.com/wolfSSL/wolfssl/pull/10327

Affected products

Product	Affected versions	Fixed in
wolfssl wolfssl	5.8.0 ≤ v < 5.9.2	5.9.2

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