G-P09 · TOPIC · supply-chain-securityGCRI dossier · service level R0
GCRICybersecurity and Digital ResilienceIn development
Topic dossier · Cybersecurity and Digital Resilience

Supply chain security

Software is assembled from open-source libraries, commercial components, build tools and update channels, and hardware from components made across many countries. Attackers who compromise a widely used component or update can reach thousands of downstream users at once. This page sets out how supply chain attacks work, how software provenance and composition are made visible, and what evidence serves developers, buyers and regulators.

Systems · around this subjectDesign, not a record

Security posture and third parties

Supply chain security · Enterprise network · Quarter 4

Two critical suppliers unassessedGCRI · Cybersecurity and Digital Resilience

CSF profile, current vs target

tier 1 to 4

Critical suppliers

Supplier ACloud hostingYesMedium
Supplier BPayroll SaaSNoUnknown
Supplier CManaged SOCYesLow
Supplier DIdentity providerNoUnknown

Critical vulnerabilities open

Security posture and third parties: the screen's structure, terms and states for Supply chain security.Placeholder names and illustrative values; a design, not a record or a live system.

Fig.Security posture and third parties. Design wireframe with placeholder names and illustrative values, not a record or a live system.

01In brief

The short answer.

Software supply chain security is the protection of the components, tools and channels used to build and deliver software. Dependencies run deep, build and update systems are targets, and critical open-source projects rely on few maintainers, so software bills of materials and verifiable provenance help organizations see and respond.

02Geography

Activity and hazards in Europe.

For supply chain security, in GCRI's spatial-intelligence reading, the map opens on population density, night lights and true-colour imagery with true colour from NASA GIBS, framed on Europe; every other NASA layer, live feed and forecast waits in the layer list.

The interactive map needs JavaScript; the layer list and sources are below.

Layers 3

Activity and hazards, for this page

Latest available

NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth

Loading the latest NASA imagery.

Drag to move. Ctrl or ⌘ and scroll, pinch or the buttons to zoom; hover for the values under the pointer; reset returns to the region.

For supply chain security, in GCRI's spatial-intelligence reading, the map opens on population density, night lights and true-colour imagery with true colour from NASA GIBS, framed on Europe; every other NASA layer, live feed and forecast waits in the layer list.Satellite and model products as NASA publishes them, each with its own date; indicators, not assessments of any place; claim ceiling INTEGRATED.

Data: NASA GIBS · ASTER GDEM · Blue Marble · © OpenStreetMap contributors · Natural Earth · GDACS · Copernicus Sentinel-2 L2A · NASA HLS S30Sources and licences

  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Center for International Earth Science Information Network (CIESIN), Columbia University. 2018. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11. NASA Socioeconomic Data and Applications Center (SEDAC). Licensed under CC BY 4.0. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). CC BY 4.0
  • VIIRS Black Marble night-time lights, NASA Goddard Space Flight Center; distributed by the NASA Level-1 and Atmosphere Archive and Distribution System (LAADS DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • VIIRS near-real-time products (flood, land surface temperature, snow cover, corrected reflectance), NASA LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • MODIS land products (vegetation indices, gross primary production, land cover), NASA LP DAAC and LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • ASTER GDEM is a product of METI and NASA (ASTER Global Digital Elevation Model V003, NASA LP DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com. Public domain
  • © OpenStreetMap contributors (ODbL), via NASA GIBS (coastlines, boundaries, roads and place names). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). ODbL
  • Blue Marble, NASA Earth Observatory; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Context on the globe and flat map: coastlines, boundaries, roads and place names from NASA GIBS reference layers (OpenStreetMap data, ODbL, © OpenStreetMap contributors); Blue Marble imagery as an optional base; 3D terrain and the elevation read-out from the ASTER GDEM elevation colour index (5 m to 200 m classes, exaggerated for legibility). Boundaries are drawn as published and imply no position on any territory.
  • Globe: MapLibre GL JS 6.9.1, BSD-3-Clause, © MapLibre contributors.
  • Live: GDACS (EC JRC / UN OCHA) Events are indicative, not official warnings.
  • Observed (EO): Copernicus Sentinel-2 L2A (contains modified Copernicus Sentinel data 2026), Microsoft Planetary Computer
  • Observed (EO): NASA HLS S30 (contains modified Copernicus Sentinel data 2026). We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS).
  • Optional layers (35 sources in the layer list: live, forecast, observed and context) print their provider credit on the map and here when switched on; forecasts are model output and derived indices are estimates.

Layers and dates

  • Population density, 2020: Population: CIESIN, Columbia University, Gridded Population of the World v4.11 (2018), NASA SEDAC, CC BY 4.0 · static
  • Night-time lights, daily: VIIRS Black Marble (VNP46A2), NASA LAADS DAAC · 12 Oct 2026
  • True colour: VIIRS NOAA-20 corrected reflectance, NASA LANCE · 13 Oct 2026
  • Land cover type (IGBP), yearly: MODIS Terra and Aqua land cover (MCD12Q1), NASA LP DAAC · 2024
  • Flood water, 3-day composite: VIIRS Global Flood Product, NASA LANCE · 14 Oct 2026
  • Enhanced vegetation index, rolling 8 days: MODIS Terra EVI, NASA LANCE · 13 Oct 2026

03The question

Supply chain security: how the risk develops.

Software and hardware dependency risk. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Dependencies run deep

A typical application includes hundreds of open-source packages, each with its own dependencies. A flaw or backdoor deep in the tree reaches every product that uses it.

Mechanism

Build and update channels are targets

Compromising a build system or update server lets attackers distribute malicious code signed and delivered as legitimate updates.

Mechanism

Maintainers are few and stretched

Critical open-source projects are often maintained by small volunteer teams, making them vulnerable to burnout, takeover and social engineering.

Mechanism

Visibility enables response

When a widely used component is found vulnerable, organizations with a software bill of materials can find and fix affected systems quickly; others search blind.

04Key terms

Terms used on this page.

Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.

TermDefinition
Software bill of materialsA machine-readable inventory of the components in a piece of software.
Build provenanceVerifiable information about how, where and from what a software artefact was built.
DependencyA software component that another component relies on to work.
05Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Products shipped with a software bill of materialspercent of productsper assessmentVendor disclosuresDECLARED
Open-source dependencies with known vulnerabilitiescountweeklySoftware composition analysisOBSERVED
Builds with verifiable provenancepercent of buildsmonthlyBuild attestation recordsOBSERVED
Malicious packages reported in registriescountmonthlyPackage registry and research reportsREPORTED
Critical projects with security practices in placescore on a stated checklistper assessmentOpen-source scorecardsESTIMATED
Time to remediate a critical component vulnerabilitydaysper eventRemediation recordsOBSERVED
06Canvas

From sources to decisions.

The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.

Pipeline canvas · Supply chain security as a run graphDesign, not a record
Supply chain security: supply chain disruption analysisThe bill of materials is mapped through its tiers; concentration and chokepoints are found; disruption scenarios compare time to recover with time to survive; mitigations close the gap. Design of the process, not a record of a run.

Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.

07Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
OpenSSF ScorecardAutomated checks of open-source project security practicesOpen source, Apache 2.0
SLSA frameworkLevels of supply chain integrity for software buildsOpen, community specification
CycloneDX and SPDX specificationsStandard formats for software bills of materialsOpen standards (SPDX is ISO/IEC 5962)
OSV open source vulnerability databaseVulnerabilities mapped to open-source package versionsOpen, CC BY 4.0
EU Cyber Resilience Act and NIST Secure Software Development FrameworkRequirements and practices for secure productsPublic, EU and US government terms
08Decisions

Who decides, and what the evidence serves.

Cybersecurity and Digital Resilience prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Software developers and vendorsWhich components to trust and how to secure buildsDependency analyses; provenance assessments
Buyers and procurement authoritiesWhat supply chain evidence to requireSBOM reviews; security terms
RegulatorsHow to apply product security requirementsAdoption and vulnerability evidence

Outputs this topic produces

  • Dependency network analyses of critical software
  • SBOM adoption and quality reviews
  • Build provenance assessments
  • Evidence notes for procurement security terms
09Core questions

What experts ask.

Compromising one widely used component can give access to thousands of downstream organizations, which makes supply chains attractive to capable attackers. Accidental weaknesses in common libraries can have the same reach. Because organizations cannot inspect everything they use, they depend on the security practices of suppliers they may not know exist.

  • Which software and hardware components does a system contain, and where do they come from?
  • How are build systems, update channels and code repositories protected against tampering?
  • How sustainable is the maintenance of critical open-source components, and who funds it?
  • How can buyers obtain credible evidence of suppliers' security practices?
10Mechanisms

Drivers and processes.

Supply chain risk arises at every stage from development to delivery and update.

Software

Components and builds

Applications depend on many libraries, each with its own dependencies. Compromised build systems or update servers can distribute malicious code as a trusted update.

Hardware

Devices and firmware

Firmware and hardware components can carry weaknesses that are hard to detect and fix, and replacement can take years.

Maintainers

Human foundations

Critical open-source projects may rely on a few volunteers. Burnout, takeover of abandoned projects or social engineering of maintainers create risk.

Supply chain incidents have shown two distinct patterns. In one, attackers compromise a supplier's build or update process so that a legitimate product delivers malicious code. In the other, a vulnerability in a widely used open-source component is discovered and must be found and fixed across countless systems. Both reward organizations that know what they run and can update it quickly.

11Methods and data

How the evidence is built, and its limits.

  1. 01

    Software bills of materials

    Inventories of components in a product. They improve visibility but must be accurate and kept current to be useful.

  2. 02

    Build provenance

    Methods that record and verify how software was built, so tampering can be detected. Adoption is growing but uneven.

  3. 03

    Dependency analysis

    Graph analysis of software ecosystems, applying network science and contagion, identifies components on which many systems depend.

  4. 04

    Hardware assurance

    Testing and supply chain controls for hardware. Full verification is rarely feasible, so assurance relies on trusted processes.

12Methods

How it is studied, and what the methods cannot say.

  1. Cybersecurity and cryptographyControl baselines and gap analysis · Exploited vulnerability prioritisationApplied here
  2. Software and safety-critical systems engineeringSecure development life cycle · Safety and security co-assuranceApplied here
  3. Network science and contagionAttack path analysis · Digital dependency concentration · Coordination detectionApplied here
13Questions

Questions and answers.

What is a software bill of materials?
A formal, machine-readable inventory of the components and dependencies in a piece of software, used to track vulnerabilities and licences.
What is a software supply chain attack?
An attack that compromises software by tampering with a component, build system or update channel, so that malicious code reaches users through trusted routes.
What is SLSA?
Supply-chain Levels for Software Artifacts, a framework of requirements for securing build processes and producing verifiable provenance.
Is open-source software riskier than proprietary software?
Not inherently. Open source allows public inspection, but critical projects can be under-resourced. Proprietary software can carry the same dependencies with less visibility.
Can supply chain attacks be prevented?
Not entirely. Layered measures, including provenance verification, least privilege for software, monitoring and rapid response, reduce their likelihood and impact.
Does the platform assess suppliers?
No. It publishes research on supply chain risk and does not assess, rate or endorse suppliers.
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