Use-after-free in wolfSSL - CVE-2026-15442
Published: October 5, 2026
Vulnerability identifier: #VU153288
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15442
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a heap-use-after-free.
The vulnerability exists due to a heap-use-after-free in the TLS shutdown state handling when an application reads data after a partial wolfSSL_read() and bidirectional wolfSSL_shutdown(). A remote attacker can continue sending data during shutdown to cause a heap-use-after-free.
The condition requires a partial read, which can occur when the application uses a small user buffer.
Affected software
wolfSSL
How to mitigate CVE-2026-15442
Install security update from vendor's website.
wolfSSL - update to 5.9.4