Swagger-UI endpoint 404 (5.32.1 - 5.32.4)

Q&A

• OS: macOS
• Browser: chrome
• Version: 147.0.7727.102
• Method of installation: java spring-boot
• Swagger-UI version: 5.32.1 - 5.32.4
• Swagger/OpenAPI version: OpenAPI 3.0

Content & configuration

Gradle spring-boot project with webmvc module and added constrain to update 5.32.0 to 5.32.1 ( or 5.32.4 )

Example Swagger/OpenAPI definition:

N/A

Swagger-UI configuration options:

@OpenAPIDefinition(
        info = @Info(
                title = "TMKP Backend API",
                version = "1.0",
                description = "API documentation for TMKP Backend Service"
        ),
        security = @SecurityRequirement(name = "Bearer Authentication")
)
@SecurityScheme(
        name = "Bearer Authentication",
        type = SecuritySchemeType.HTTP,
        bearerFormat = "JWT",
        scheme = "bearer",
        description = "JWT Bearer token authentication.
)

N/A

Describe the bug you're encountering

While upgrading the Swagger-UI dependency on a gradle spring-boot project to 5.32.1 ( also 5.32.4 ) we noticed that the endpoint "/swagger-ui/index.html" is returning 404

Thu Apr 23 15:53:16 WEST 2026
There was an unexpected error (type=Not Found, status=404).

To reproduce...

Steps to reproduce the behavior:

1. Add dependency to the gradle project to use the latest minor version ( 5.32.4 )
2. Go to '/swagger-ui/index.html'
3. See 404 error

Expected behavior

The swagger-ui page is shown.

Screenshots

N/A

Start by reproducing the Gradle Spring Boot webmvc setup with Swagger UI 5.32.0, then compare it with 5.32.1 and 5.32.4 while requesting /swagger-ui/index.html. Check whether the endpoint serves the Swagger UI page after the dependency upgrade; done means the page loads instead of returning 404.