# Faultprint Assessment Draft: Fannie Mae

## Status

Draft generated from the v14 consistency-clean baseline. v14 applies source-stress handling, null-row controls, low-resemblance caveats, and boundary-hygiene fixes.

This draft is findings-only. It does not recommend actions, predict failure, assert illegality, or claim that the institution has failed.

## Corpus Position

- Institution: Fannie Mae
- Sector: Mortgage underwriting
- Client-eligible findings included: 3
- Caveated findings included: 3
- Findings with source-verification limitations: 0

## Pathology Mix

- Multi-Actor Handoff Diffusion: 1
- Classification Gatekeeping: 1
- AI Authority Acceleration: 1

## Resemblance Mix

- moderate_resemblance: 3

## Findings

### Finding 1: AI Authority Acceleration

Condition: Manual underwriting and optional validation

Resemblance band: moderate_resemblance

Output status: client_ready_with_caveat

Finding statement: Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.

Evidence anchor: Lenders may use automated or manual underwriting; DU Validation Service is optional and borrower participation may not be required.

Source: https://selling-guide.fanniemae.com/sel/b3-2-01/general-information-du

Falsification evidence: Operational records showing manual underwriting is discouraged or rarely available would weaken this mitigant.

Boundary: Does not prove controls are operationally strong.

### Finding 2: Classification Gatekeeping

Condition: Automated underwriting authority

Resemblance band: moderate_resemblance

Output status: client_ready_with_caveat

Finding statement: Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.

Evidence anchor: DU is described as an automated mortgage loan underwriting system used to assess credit risk and establish eligibility for sale and delivery to Fannie Mae.

Source: https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-desktop-originator

Falsification evidence: Records showing DU outputs are routinely independently reviewed and corrected before downstream reliance would downgrade exposure.

Boundary: Does not prove DU outputs are unchallengeable or harmful.

### Finding 3: Multi-Actor Handoff Diffusion

Condition: DU Validation vendor dependency

Resemblance band: moderate_resemblance

Output status: client_ready_with_caveat

Finding statement: Operating row shows a condition also present in postmortem libraries, but current public evidence is not enough to treat it as high exposure.

Evidence anchor: Fannie Mae states DU validation service uses third-party data vendors to independently validate borrower income, employment, and asset data.

Source: https://singlefamily.fanniemae.com/applications-technology/desktop-underwriter-validation-service/du-validation-service-verification-report-vendors

Falsification evidence: Vendor quality reports and reconciliation logs showing low error and strong correction would downgrade exposure.

Boundary: Does not establish that vendor validation is wrong or harmful in any particular loan file.

## Internal Exclusions

No internal revise/hold rows were included in this report draft.

## Report Boundary

This draft is based on the reviewed corpus and current Faultprint evidence libraries. It identifies structural conditions and evidence requirements. It is not a legal opinion, audit conclusion, compliance certification, recommendation, or prediction.