diff --git a/scripts/ci/cuda/ci_install_dependency.sh b/scripts/ci/cuda/ci_install_dependency.sh
index afd0383bb..ab2614e82 100755
--- a/scripts/ci/cuda/ci_install_dependency.sh
+++ b/scripts/ci/cuda/ci_install_dependency.sh
@@ -149,7 +149,12 @@ fi
 # Install protoc
 bash "${SCRIPT_DIR}/../utils/install_protoc.sh"
 
-mark_step_done "Python package site hygiene & install protoc"
+# Install Rust toolchain (needed by crates built via setuptools-rust, e.g. the
+# native gRPC extension bundled into the sglang wheel).
+bash "${SCRIPT_DIR}/../utils/install_rustup.sh"
+export PATH="${CARGO_HOME:-$HOME/.cargo}/bin:${PATH}"
+
+mark_step_done "Python package site hygiene & install protoc + rust"
 
 # ------------------------------------------------------------------------------
 # Pip / uv toolchain & stale package cleanup
diff --git a/scripts/ci/npu/npu_ci_install_dependency.sh b/scripts/ci/npu/npu_ci_install_dependency.sh
index 4accb8e23..e180cf083 100755
--- a/scripts/ci/npu/npu_ci_install_dependency.sh
+++ b/scripts/ci/npu/npu_ci_install_dependency.sh
@@ -32,6 +32,12 @@ export UV_NO_CACHE=true
 export UV_SYSTEM_PYTHON=true
 export UV_INDEX_STRATEGY=unsafe-best-match
 
+# Install Rust toolchain (needed by crates built via setuptools-rust, e.g. the
+# native gRPC extension bundled into the sglang wheel).
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+bash "${SCRIPT_DIR}/../utils/install_rustup.sh"
+export PATH="${CARGO_HOME:-$HOME/.cargo}/bin:${PATH}"
+
 # Pin wheel to 0.45.1, REF: https://github.com/pypa/wheel/issues/662
 ${UV_PIP_INSTALL} wheel==0.45.1 pybind11 pyyaml decorator scipy attrs psutil
 
diff --git a/scripts/ci/utils/install_rustup.sh b/scripts/ci/utils/install_rustup.sh
new file mode 100755
index 000000000..2b8d11f2c
--- /dev/null
+++ b/scripts/ci/utils/install_rustup.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# Ensure a Rust toolchain (rustc/cargo) is installed for crates built from
+# source, e.g. the native gRPC extension bundled into the sglang wheel via
+# setuptools-rust. Minimum supported version is 1.85 (edition 2024).
+set -euxo pipefail
+
+# Pick up cargo if rustup was installed in a previous CI step.
+export PATH="${CARGO_HOME:-$HOME/.cargo}/bin:${PATH}"
+
+if command -v cargo >/dev/null 2>&1 && command -v rustc >/dev/null 2>&1; then
+    echo "rust already installed: $(rustc --version), $(cargo --version)"
+    exit 0
+fi
+
+echo "rust not found, installing via rustup..."
+
+# rustup.rs requires curl — make sure it's present.
+if ! command -v curl >/dev/null 2>&1; then
+    if command -v apt-get &> /dev/null; then
+        apt-get update || true
+        apt-get install -y --no-install-recommends curl ca-certificates
+    elif command -v yum &> /dev/null; then
+        yum install -y curl ca-certificates
+    else
+        echo "ERROR: curl is required to install rustup, but no supported package manager was found"
+        exit 1
+    fi
+fi
+
+curl --proto '=https' --tlsv1.2 --retry 3 --retry-delay 2 -sSf https://sh.rustup.rs \
+    | sh -s -- -y --no-modify-path
+
+# Make cargo/rustc visible to the rest of this shell and to subsequent
+# GitHub Actions steps in the same job.
+export PATH="${CARGO_HOME:-$HOME/.cargo}/bin:${PATH}"
+if [ -n "${GITHUB_PATH:-}" ]; then
+    echo "${CARGO_HOME:-$HOME/.cargo}/bin" >> "${GITHUB_PATH}"
+fi
+
+rustc --version
+cargo --version