What happened:
When using grant check on my CycloneDX generated application.cdx.json SBOM from my JVM project, I get a wrong error log statement, although the check is working as expected without failure.

I verified that the check is still working by changing my grant configuration in the .grant.yaml and saw, that all configured rules get applied correctly.

Wrong log statement:
[0000] ERROR unable to determine case for -: unable to determine SBOM or licenses for stdin: sbom format not recognized

Full log output:

/grant -vvv check ./application/build/reports/application.cdx.json
[0000]  INFO grant version: 0.2.7
[0000] DEBUG config:
  log:
      quiet: false
      level: trace
      file: ""
  dev:
      profile: none
  config: .grant.yaml
  output: table
  show-packages: false
  non-spdx: false
  quiet: false
  osi-approved: false
  rules:
     - name: MIT
        reason: \<redacted>
        pattern: MIT
        severity: ""
        mode: allow
        exceptions: []
      \<redacted additional configured rules>  
      - name: default-deny-all
        reason: All licenses need to be explicitly allowed
        pattern: '*'
        severity: ""
        mode: deny
        exceptions: []  
[0000] ERROR unable to determine case for -: unable to determine SBOM or licenses for stdin: sbom format not recognized
[0000] TRACE worker stopped component=eventloop
[0000] TRACE signal exit component=eventloop
* ./application/build/reports/application.cdx.json
  * No License Violations Found for Rule MIT
  \<redacted additional configured rules>

What you expected to happen:
The wrong error log is not shown.

Steps to reproduce the issue:
I see the behavior with Grant versions 0.2.4 and 0.2.7 . I can only reproduce the bug in our CI. Grant runs there inside an Alpine 3.22.0 Docker image on a Linux host.

The bug does not occur when running Grant locally on macOS 15.5 . It also does not occur when I run the Alpine Docker image through Docker Desktop on my macOS machine.

My guess is that the bug should be reproducible on a machine running Linux natively.

Environment:

• Output of grant version: 0.2.7
• OS (e.g: cat /etc/os-release or similar): Alpine Linux 3.22.0 Docker Image on Linux host