UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

For the monthly distribution period from: June 18, 2026 to July 17, 2026

Commission File Number of issuing entity: 333-283864-04

Central Index Key Number of issuing entity: 0002110410

Benchmark 2026-B42 Mortgage Trust
(Exact name of issuing entity as specified in its charter)

Commission File Number of depositor: 333-283864

Central Index Key Number of depositor: 0001013454

Deutsche Mortgage & Asset Receiving Corporation
(Exact name of depositor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001541294

German American Capital Corporation
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001701238

Citi Real Estate Funding Inc.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001541502

Goldman Sachs Mortgage Company
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001577313

National Cooperative Bank, N.A.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001549574

Barclays Capital Real Estate Inc.
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0001685185

UBS AG New York Branch
(Exact name of sponsor as specified in its charter)

Central Index Key Number of sponsor (if applicable): 0000927971

Bank of Montreal
(Exact name of sponsor as specified in its charter)

Lainie Kaye (212) 250-2500
(Name and telephone number, including area code, of the person to contact in connection with this filing)

New York
(State or other jurisdiction of incorporation or organization of the issuing entity)

38-4374861
38-4374862
38-7370560
(I.R.S. Employer Identification No.)

c/o Computershare Trust Company, N.A.
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices of the issuing entity) (Zip Code)

(667) 786-1992
(Telephone number, including area code)

Not Applicable
(Former name, former address, if changed since last report)

Registered/reporting pursuant to (check one)

Title of Class	Section 12(b)	Section 12(g)	Section 15(d)	Name of Exchange (If Section 12(b))
A-1			X
A-2			X
A-4			X
A-5			X
A-SB			X
X-A			X
X-B			X
A-S			X

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes X No

Part I - DISTRIBUTION INFORMATION

Item 1. Distribution and Pool Performance Information.

On July 17, 2026 a distribution was made to holders of the certificates issued by Benchmark 2026-B42 Mortgage Trust.

The distribution report is attached as an Exhibit to this Form 10-D, please see Item 10(b), Exhibit 99.1 for the related information.

No assets securitized by Deutsche Mortgage & Asset Receiving Corporation (the "Depositor") and held by Benchmark 2026-B42 Mortgage Trust were the subject of a demand to repurchase for breach of the representations and warranties contained in the underlying transaction documents during the distribution period from June 18, 2026 to July 17, 2026.

The Depositor filed its most recent Form ABS-15G in accordance with Rule 15Ga-1 under the Securities Exchange Act of 1934 (a "Rule 15Ga-1 Form ABS-15G") on May 13, 2026. The CIK number for the Depositor is 0001013454.

German American Capital Corporation ("GACC"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 13, 2026. The CIK number of GACC is 0001541294.

Citi Real Estate Funding Inc. ("CREF"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 10, 2026. The CIK number of CREF is 0001701238.

Goldman Sachs Mortgage Company ("GSMC"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on May 12, 2026. The CIK number of GSMC is 0001541502.

National Cooperative Bank, N.A. ("NCB "), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 26, 2026. The CIK number of NCB is 0001577313.

Barclays Capital Real Estate Inc., one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 13, 2026. The CIK number of Barclays Capital Real Estate Inc. is 0001549574.

UBS AG New York Branch ("UBS AG"), one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on February 12, 2026. The CIK number of UBS AG is 0001685185.

Bank of Montreal, one of the sponsors, has filed a Form ABS-15G pursuant to Rule 15Ga-1 under the Securities Exchange Act of 1934 on May 13, 2026. The CIK number of Bank of Montreal is 0000927971.

Item 1A. Asset-Level Information.

ABS Asset Data File (filed as Exhibit 102 to the registrant's Form ABS-EE filed on July 30, 2026 under Commission File No. 333-283864-04 and incorporated by reference herein).

ABS Asset Related Document (filed as Exhibit 103 to the registrant's Form ABS-EE filed on July 30, 2026 under Commission File No. 333-283864-04 and incorporated by reference herein).

Part II - OTHER INFORMATION

Item 10. Exhibits.

(a) The following is a list of documents filed as part of this Report on Form 10-D:

(99.1) Monthly report distributed to holders of the certificates issued by Benchmark 2026-B42 Mortgage Trust, relating to the July 17, 2026 distribution.

(102) ABS Asset Data File (filed as Exhibit 102 to the registrant's Form ABS-EE filed on July 30, 2026 under Commission File No. 333-283864-04 and incorporated by reference herein).

(103) ABS Asset Related Document (filed as Exhibit 103 to the registrant's Form ABS-EE filed on July 30, 2026 under Commission File No. 333-283864-04 and incorporated by reference herein).

(b) The exhibits required to be filed by the Registrant pursuant to this Form are listed above.

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 thereunto duly authorized.

Deutsche Mortgage & Asset Receiving Corporation
(Depositor)

/s/ Matt Smith
Matt Smith, Director

Date: July 30, 2026

/s/ R. Chris Jones
R. Chris Jones, Managing Director

Date: July 30, 2026

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549

FORM 10-D

ASSET BACKED ISSUER DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Registered/reporting pursuant to (check one)

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549

ASSET BACKED ISSUER
DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934

Benchmark 2026-B42 Mortgage Trust 10-D