UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

________________

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest Event

Reported): ~~September~~ 28November 2, 2007

CHL Mortgage Pass-Through Trust 2007-18

(Exact name of the issuing entity)

Commission File Number of the issuing entity: 333-140958-18

CWMBS, Inc.

(Exact name of the depositor as specified in its charter)

Commission File Number of the depositor: 333-140958

Countrywide Home Loans, Inc.

(Exact name of the sponsor as specified in its charter)

Delaware	95-4449516
(State or Other Jurisdiction	(I.R.S. Employer
of Incorporation of the depositor)	Identification No. of the depositor)
4500 Park Granada Calabasas, California	91302
(Address of Principal Executive Offices of the depositor)	(Zip Code)

4500 Park Granada

Calabasas, California 91302

(Address of Principal (Zip Code)

Executive Offices of the depositor)

The depositor’s telephone number, including area code (818) 225-3000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any following provisions:

~~[ ]~~ o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

~~[ ]~~ o Soliciting material pursuant to Rule 14a-12(b) under the Exchange Act (17 CFR 240.14a- 12(b))

~~[ ]~~ o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 ~~CFR240~~CFR 240.14d-2(b))

~~[ ]~~ o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 ~~CFR240~~CFR 240.13e-4(c))

Section ~~9 Financial Statements and Exhibits~~ 7 Regulation FD

Item 9 7.01 Regulation FD ~~Financial Statements and Exhibits~~Disclosure.

The loan level data tape attached hereto as Exhibit 99.1 describes certain characteristics of each Mortgage Loan, including each Mortgage Loan’s principal balance as of October 1, 2007. Capitalized terms used but not defined herein have the meanings assigned to them in the prospectus supplement filed with the Securities and Exchange Commission under Rule 424(ab)(5) ~~Financial~~under ~~statements~~the Securities Act of ~~business~~1933 ~~acquired~~on October 1, 2007.

~~Not~~Item 9.01. Financial Statements ~~applicable~~and Exhibits.

(ba) ~~Pro~~Not ~~forma financial information~~applicable.

(b) Not applicable.

~~5.1~~Exhibit ~~Legality Opinion of Sidley Austin LLP~~No. Description

899.1 ~~Tax~~Characteristics ~~Opinion~~ of ~~Sidley~~the ~~Austin~~Mortgage ~~LLP (included in Exhibit 5.1).~~Loans

23.1 Consent of Sidley Austin LLP (included in Exhibits 5.1 and 8.1).

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

CWMBS, INC. ~~By: /s/ Darren Bigby Darren Bigby Executive Vice President~~

~~Dated~~By: ~~October~~ 3,/s/ Darren ~~2007~~Bigby

3Name: Darren Bigby

Title: Executive Vice President

Dated: November 7, 2007

Exhibit Index

Exhibit No. Description

5.1	Legality Opinin of Sidley Austin LLP
8.1	Tax Opinion of Sidley Austin LLP (included in Exhibit 5.1)
23.1	Consent of Sidley Austin LLP (included in Exhibits 5.1 and 8.1)

99.1	Characteristics of the Mortgage Loans

Filing Compare · CHL Mortgage Pass-Through Trust 2007-18