CVE-2026-15442: wolfSSL

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

In all builds that make use of (D)TLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSL_read() which is sometimes caused by a small user buffer passed in, then called wolfSSL_shutdown for a bidirectional close and attempted to wolfSSL_read() again while the peer continues trying to send data during the shutdown it would lead to a state where a potential heap-use-after free happened.

Affected products

• wolfSSL wolfSSL: from 4.4.0, up to and including 5.9.2

Published 2026-09-27. Last modified 2026-10-02.