diff --git a/.github/workflows/build-cbcbox.yml b/.github/workflows/build-cbcbox.yml
new file mode 100644
index 000000000000..f8b2db84d7ad
--- /dev/null
+++ b/.github/workflows/build-cbcbox.yml
@@ -0,0 +1,295 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the "Linux ARM64" jobs of
+# https://github.com/h-g-s/cbcbox/blob/cd7056156bebb4347c2273ccbc0ca5e06170970d/.github/workflows/wheel.yml
+name: Build cbcbox wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/cbcbox.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-cbcbox.yml'
+      - 'docs/packages/cbcbox.yaml'
+      - 'patches/cbcbox/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-cbcbox.yml'
+      - 'docs/packages/cbcbox.yaml'
+      - 'patches/cbcbox/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # cbcbox bumps pyproject.toml's version on master without ever pushing a
+  # git tag for it (v2.931/v2.932/v2.933 are tagged, 2.934/2.935 are not), so
+  # pin the exact commit that carries version = "2.935": cd70561 bumped
+  # 2.934 -> 2.935 on 2026-08-16T22:43:04Z and the 2.935 wheels were uploaded
+  # to PyPI ~3h20m later (2026-08-17T02:08Z), with no further pyproject.toml
+  # change in between. Update this alongside the docs/packages/cbcbox.yaml
+  # version entry.
+  CBCBOX_REF: cd7056156bebb4347c2273ccbc0ca5e06170970d
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: cbcbox
+      version: ${{ inputs.version }}
+
+  compile_linux_riscv64_generic:
+    name: Compile cbcbox ${{ matrix.version }} Linux riscv64 generic
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 300
+    env:
+      CBCBOX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout cbcbox ${{ env.CBCBOX_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: h-g-s/cbcbox
+          ref: ${{ env.CBCBOX_REF }}
+          persist-credentials: false
+
+      - name: Build generic binary (manylinux_2_39_riscv64)
+        run: |
+          for i in 1 2 3; do
+            docker pull "${MANYLINUX_RISCV64_IMAGE}" && break
+            echo "Attempt $i failed, retrying in 30s..."
+            sleep 30
+          done
+          docker run --rm \
+            -v "$PWD:/project" \
+            -e CBCBOX_BUILD_VARIANT=generic \
+            -e CBCBOX_BUILD_ONLY=1 \
+            "${MANYLINUX_RISCV64_IMAGE}" \
+            bash -c 'export PATH=/opt/python/cp313-cp313/bin:$PATH &&
+                     dnf install -y gcc-gfortran &&
+                     pip install setuptools wheel patchelf &&
+                     cd /project &&
+                     python setup.py build_ext'
+          sudo chown -R "$USER:$USER" cbc_dist/ 2>/dev/null || true
+          tar -czf cbc_dist_generic.tar.gz cbc_dist/
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-dist-linux-riscv64-generic
+          path: cbc_dist_generic.tar.gz
+          if-no-files-found: error
+
+  compile_linux_riscv64_debug:
+    name: Compile cbcbox ${{ matrix.version }} Linux riscv64 debug
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 300
+    env:
+      CBCBOX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout cbcbox ${{ env.CBCBOX_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: h-g-s/cbcbox
+          ref: ${{ env.CBCBOX_REF }}
+          persist-credentials: false
+
+      - name: Build debug binary (manylinux_2_39_riscv64)
+        run: |
+          for i in 1 2 3; do
+            docker pull "${MANYLINUX_RISCV64_IMAGE}" && break
+            echo "Attempt $i failed, retrying in 30s..."
+            sleep 30
+          done
+          docker run --rm \
+            -v "$PWD:/project" \
+            -e CBCBOX_BUILD_VARIANT=debug \
+            -e CBCBOX_BUILD_ONLY=1 \
+            "${MANYLINUX_RISCV64_IMAGE}" \
+            bash -c 'export PATH=/opt/python/cp313-cp313/bin:$PATH &&
+                     dnf install -y gcc-gfortran &&
+                     pip install setuptools wheel patchelf &&
+                     cd /project &&
+                     python setup.py build_ext &&
+                     bash scripts/build_mip_debug_cuts.sh cbc_dist_debug Cbc'
+          sudo chown -R "$USER:$USER" cbc_dist_debug/ 2>/dev/null || true
+          tar -czf cbc_dist_debug.tar.gz cbc_dist_debug/
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-dist-linux-riscv64-debug
+          path: cbc_dist_debug.tar.gz
+          if-no-files-found: error
+
+  package_linux_riscv64:
+    name: Package cbcbox ${{ matrix.version }} py3-none-manylinux_riscv64
+    needs: [setup, compile_linux_riscv64_generic, compile_linux_riscv64_debug]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    runs-on: ubuntu-24.04-riscv
+    # 24h: see the "Test wheel" step below (CLAUDE.md gotcha 598) — the 61-case
+    # MILP-solve test suite is genuinely slow on this fleet's riscv64 hardware,
+    # not hung. A single build+test job otherwise gives the test step whatever
+    # is left of this timeout, so a merely-slow (not stuck) suite can still burn
+    # the whole budget and end in "cancelled" with the already-built wheel never
+    # uploaded (run 42301146079: cancelled at 5h00m with 28/61 cases done).
+    timeout-minutes: 1440
+    env:
+      CBCBOX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout cbcbox ${{ env.CBCBOX_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: h-g-s/cbcbox
+          ref: ${{ env.CBCBOX_REF }}
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      # manylinux2014 (upstream's own x86_64/aarch64 wheel tag) predates
+      # riscv64; map to manylinux_2_39, the policy this job's image is built
+      # against.
+      - name: Patch cbcbox source
+        run: git apply python-wheels/patches/cbcbox/${{ env.CBCBOX_VERSION }}/*.patch
+
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-dist-linux-riscv64-generic
+          path: .
+      - run: tar -xzf cbc_dist_generic.tar.gz
+
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-dist-linux-riscv64-debug
+          path: .
+      - run: tar -xzf cbc_dist_debug.tar.gz
+
+      - name: Build wheel (compilation skipped — binaries pre-built)
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: .
+          output-dir: wheelhouse
+          config-file: "{package}/pyproject.toml"
+        env:
+          CIBW_BUILD: "cp313-*"
+          CIBW_SKIP: "*musllinux*"
+          CIBW_ARCHS: "riscv64"
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_BEFORE_ALL_LINUX: >
+            dnf install -y gcc-gfortran &&
+            pip install patchelf
+          CIBW_REPAIR_WHEEL_COMMAND_LINUX: ""
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-py3-none-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+      # Split from the build step above and given its own bounded timeout
+      # (CLAUDE.md gotcha 598), so the wheel is uploaded before this runs and a
+      # slow (or genuinely stuck) test run can't silently consume the rest of
+      # the job's 24h budget. Reproduces cibuildwheel's own test phase (pytest
+      # against the installed wheel, PERF_REPORT_DIR for the solver's perf
+      # reports) without its wrapping, since testing no longer happens inside
+      # the build action.
+      - name: Test wheel (manylinux_2_39_riscv64)
+        timeout-minutes: 1380  # 23h
+        run: |
+          docker run --rm \
+            -v "$PWD:/project" \
+            -v "$PWD/wheelhouse:/wheelhouse" \
+            -e PERF_REPORT_DIR=/output \
+            -e OPENBLAS_NUM_THREADS=1 \
+            "${MANYLINUX_RISCV64_IMAGE}" \
+            bash -c 'export PATH=/opt/python/cp313-cp313/bin:$PATH &&
+                     mkdir -p /output &&
+                     pip install /wheelhouse/*.whl pytest &&
+                     cd /project &&
+                     pytest tests/ -v'
+
+  gpl_sources:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    name: Collect GPL sources
+    runs-on: ubuntu-24.04-riscv
+
+    env:
+      CBCBOX_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          persist-credentials: false
+
+      # cbcbox bundles libgfortran (OpenBLAS is built from source with
+      # gfortran) into the wheel; its source comes from the image's own gcc,
+      # not from cbcbox.
+      - uses: ./actions/collect-gpl-sources
+        with:
+          image: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          packages: gcc
+          output: gpl-sources.tar
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: cbcbox-${{ env.CBCBOX_VERSION }}-gpl-sources
+          path: gpl-sources.tar
+          if-no-files-found: error
+
+  publish:
+    name: Publish cbcbox ${{ matrix.version }}
+    needs: [setup, package_linux_riscv64, gpl_sources]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      matrix: ${{ needs.setup.outputs.matrix }}
+      artifact-pattern: cbcbox-${{ matrix.version }}-py3-none-manylinux_riscv64
+      gpl-sources-artifact: cbcbox-${{ matrix.version }}-gpl-sources
+      gpl-sources-description: gcc (libgfortran, linked into the bundled OpenBLAS)
diff --git a/docs/packages/cbcbox.yaml b/docs/packages/cbcbox.yaml
new file mode 100644
index 000000000000..b1f139bea084
--- /dev/null
+++ b/docs/packages/cbcbox.yaml
@@ -0,0 +1,13 @@
+package-name: cbcbox
+source-code: https://github.com/h-g-s/cbcbox
+license: EPL-2.0
+versions:
+- version: '2.935'
+  files:
+  - python: 3.9:manylinux
+  - python: 3.10:manylinux
+  - python: 3.11:manylinux
+  - python: 3.12:manylinux
+  - python: 3.13:manylinux
+  - python: 3.14:manylinux
+  - python: 3.15:manylinux
diff --git a/patches/cbcbox/2.935/0001-setup.py-map-riscv64-to-manylinux_2_39_riscv64-in-th.patch b/patches/cbcbox/2.935/0001-setup.py-map-riscv64-to-manylinux_2_39_riscv64-in-th.patch
new file mode 100644
index 000000000000..066c2ea7fad5
--- /dev/null
+++ b/patches/cbcbox/2.935/0001-setup.py-map-riscv64-to-manylinux_2_39_riscv64-in-th.patch
@@ -0,0 +1,40 @@
+From 340631d1648be435e1bc354bf4aa4150aec41603 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Thu, 15 Oct 2026 12:00:00 +0000
+Subject: [PATCH] setup.py: map riscv64 to manylinux_2_39_riscv64 in the wheel
+ platform tag
+
+genericpy_bdist_wheel.get_tag() only special-cases linux_x86_64 and
+linux_aarch64 (both mapped to the manylinux2014 policy this project
+targets on those architectures). riscv64 falls through unmapped, so a
+CIBUILDWHEEL=1 build on linux_riscv64 would otherwise ship a wheel
+tagged plain 'linux_riscv64', which pip rejects as non-manylinux.
+
+manylinux2014 predates riscv64 entirely (PEP 599 has no riscv64
+mapping), so riscv64 is tagged against manylinux_2_39 instead -- the
+oldest manylinux policy with a riscv64 image, matching the
+quay.io/pypa/manylinux_2_39_riscv64 container used to build it.
+
+Upstream-Status: Inappropriate [cbcbox's own CI (wheel.yml) does not build for riscv64 at all -- no GitHub-hosted riscv64 runner exists -- so this mapping has no upstream job to exercise it]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ setup.py | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/setup.py b/setup.py
+index 15d501d..a8c01e4 100644
+--- a/setup.py
++++ b/setup.py
+@@ -27,6 +27,8 @@ class genericpy_bdist_wheel(_bdist_wheel):
+                 plat = "manylinux2014_x86_64"
+             elif plat == "linux_aarch64":
+                 plat = "manylinux2014_aarch64"
++            elif plat == "linux_riscv64":
++                plat = "manylinux_2_39_riscv64"
+         return python, abi, plat
+ 
+ 
+-- 
+2.43.0
+