AWS S3 credential_process execution fails on macOS

[KrishnaNagam]

Describe the bug
AWS S3 credential_process spawn fails with the below error on macos.

2026-07-02 00:03:35,595 [Thread-73] WARN  ch.cyberduck.core.s3.S3CredentialsConfigurator - Failure "Cannot run program "sh": error=0, posix_spawn failed" parsing credentials from output of command ***

To Reproduce
Steps to reproduce the behavior:

1. Create a profile with credential_process in ~/.aws/credentials file
2. Enable "S3 (Credentials from AWS Command Line Interface)" profile
3. Create connection with the AWS profile added ~/.aws/credentials file
4. Click on connect
5. See the error in debug logs

Expected behavior
A successful execution of credential process.

Desktop (please complete the following information):

• OS: macOS
• Version 26.5.1

Additional context
I think error is because of missing jspawnhelper lib.

[ct-dave]

I am also seeing this behavior. I have been able to get it to work properly on at least one MacOS machine by forcing the process to use fork.

export JAVA_TOOL_OPTIONS="-Djdk.lang.Process.launchMechanism=FORK"
/Applications/Cyberduck.app/Contents/MacOS/Cyberduck &

It's possible that this is connected to the jspawnhelper presence in runtime-excludes.properties.