Double free in wolfSSL - CVE-2026-5460
Published: April 14, 2026
Vulnerability identifier: #VU125935
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5460
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: wolfSSL
Affected software:
wolfSSL
wolfSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a double free in the TLS 1.3 PQC hybrid KeyShare error cleanup path when processing a truncated ServerHello KeyShare. A remote attacker can send a specially crafted ServerHello message to cause a denial of service.
The issue is triggered by a malicious TLS 1.3 server sending a truncated PQC hybrid KeyShare.
How to mitigate CVE-2026-5460
Install security update from vendor's website.