GHSA-4XGF-CPJX-PC3J pydantic-settings: NestedSecretsSettingsSource follows symlinks outside secrets_dir, enabling local file read and bypassing secrets_dir_max_size

Summary NestedSecretsSettingsSource reads secret values from files in a configured secretsdir. When secretsnestedsubdir=True, a directory entry inside secretsdir that is a symbolic link pointing outside secretsdir is followed, so files outside the configured directory are read into settings value...