CVE-2026-7531

CRITICAL

Use-after-free in PQC hybrid key-share handling

Title source: cna
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 9.8
EPSS 0.0035
EPSS Percentile 27.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (2)
wolfSSL/wolfSSL 5.8.0 - 5.9.1
wolfssl/wolfssl 5.8.0 - 5.9.2
Published Jun 25, 2026
Tracked Since Jun 26, 2026