static void del_session(SSL_CTX *sctx, SSL_SESSION *session)
{
    simple_ssl_session *sess, *prev = NULL;
    const unsigned char *id;
    unsigned int idlen;
    id = SSL_SESSION_get_id(session, &idlen);
    for (sess = first; sess; sess = sess->next) {
        if (idlen == sess->idlen && !memcmp(sess->id, id, idlen)) {
            if (prev)
                prev->next = sess->next;
            else
                first = sess->next;
            OPENSSL_free(sess->id);
            OPENSSL_free(sess->der);
            OPENSSL_free(sess);
            return;
        }
        prev = sess;
    }
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.