openai/codex · error · std::io::Error

fs/readFile returned invalid base64 dataBase64: {err}

Error message

fs/readFile returned invalid base64 dataBase64: {err}

What it means

Error "fs/readFile returned invalid base64 dataBase64: {err}" thrown in openai/codex.

Source

Thrown at codex-rs/exec-server/src/sandboxed_file_system.rs:121

        options: ReadFileOptions,
        sandbox: Option<&FileSystemSandboxContext>,
    ) -> FileSystemResult<Vec<u8>> {
        let sandbox = require_platform_sandbox(sandbox)?;
        validate_native_path(path)?;
        let response = self
            .run_sandboxed(
                sandbox,
                FsHelperRequest::ReadFile(FsReadFileParams {
                    path: path.clone(),
                    follow_symlinks: (!options.follow_symlinks).then_some(false),
                    sandbox: None,
                }),
            )
            .await?
            .expect_read_file()
            .map_err(map_sandbox_error)?;
        STANDARD.decode(response.data_base64).map_err(|err| {
            io::Error::new(
                io::ErrorKind::InvalidData,
                format!("fs/readFile returned invalid base64 dataBase64: {err}"),
            )
        })
    }

    async fn write_file(
        &self,
        path: &PathUri,
        contents: Vec<u8>,
        options: WriteFileOptions,
        sandbox: Option<&FileSystemSandboxContext>,
    ) -> FileSystemResult<()> {
        let sandbox = require_platform_sandbox(sandbox)?;
        validate_native_path(path)?;
        self.run_sandboxed(
            sandbox,
            FsHelperRequest::WriteFile(FsWriteFileParams {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/exec-server/src/sandboxed_file_system.rs:121 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/9bcff6261a637984. Report an issue: GitHub.