# Proven, not promised: Chainguard Containers achieves SLSA Build Level 3

DevFeed: [Proven, not promised: Chainguard Containers achieves SLSA Build Level 3](<https://devfeed.tech/articles/proven-not-promised-chainguard-containers-achieves-slsa-build-level-3-13206.md>)

Original publisher: [Read original article](<https://www.chainguard.dev/unchained/proven-not-promised-chainguard-containers-achieves-slsa-build-level-3>)

Published: 2026-08-17T00:00:00Z

Content type: release

Language: en

Sources: [Chainguard: Unchained](<https://devfeed.tech/sources/chainguard-unchained.md>)

Topics: [chainguard](<https://devfeed.tech/topics/chainguard.md>), [chainguard containers](<https://devfeed.tech/topics/chainguard-containers.md>), [supply-chain-security](<https://devfeed.tech/topics/supply-chain-security.md>), [software bill of materials](<https://devfeed.tech/topics/software-bill-of-materials.md>), [Security](<https://devfeed.tech/topics/security.md>)

Tags: [chainguard](<https://devfeed.tech/tags/chainguard.md>), [chainguard-containers](<https://devfeed.tech/tags/chainguard-containers.md>), [provenance](<https://devfeed.tech/tags/provenance.md>), [sbom](<https://devfeed.tech/tags/sbom.md>), [security](<https://devfeed.tech/tags/security.md>), [signing](<https://devfeed.tech/tags/signing.md>), [slsa](<https://devfeed.tech/tags/slsa.md>), [software-supply-chain-security](<https://devfeed.tech/tags/software-supply-chain-security.md>), [supply-chain](<https://devfeed.tech/tags/supply-chain.md>)

## AI overview

Chainguard says Coalfire independently assessed the Chainguard Containers build and release system as meeting SLSA Build Level 3 requirements. The article describes hardened, isolated builds, separately managed signing, provenance generation, and signed SBOMs for releases.

## Source excerpt

Coalfire independently assessed Chainguard Containers at SLSA Build Level 3, validating hardened builds, provenance, and supply chain integrity.