mattermost

Chart · Messaging · standard · v0.0.33

digest pinnedcosign signedSPDX SBOMSLSA provenanceamd64 · arm64Rebuilt 2026-10-11

Open-source, self-hosted team messaging and collaboration platform (a Slack alternative) with channels, direct messages, file sharing, and integrations. Packaged from Mattermost's official Team Edition server release; requires an external PostgreSQL.

Version

0.0.33 · latest 0.0.32 0.0.31

The latest line lives at the base page; older lines have their own page so you can pin and verify exactly that version. Only the most recent releases are listed — an older chart pins an older image digest.

Deployed image digest

sha256:f89a620c9e6dc3d423ea979d4e5288bf5183a2df3fc422f0d7b53486eba534c7

Chart OCI version

oci://ghcr.io/quenchworks/charts/mattermost:0.0.33

The chart pins its image by this signed digest, so you never track it yourself. Signatures, SBOM, and provenance attach to the same digest.

Signed

cosign keyless

SBOM

SPDX, on image

Provenance

SLSA build

Architectures

amd64, arm64

Runs as

nonroot (uid 1001)

Root filesystem

read-only

Image size

410.3 MB

Security report (Trivy)

A· 96/1002 open · no upstream fix yet

Vulnerability detail

mattermost 11.11.1 · 1 CVE

CVE	Severity	Package	Installed	Fixed in	Title
GO-2026-5932	UNKNOWN	golang.org/x/crypto	v0.57.0	— not fixable	The golang.org/x/crypto/openpgp package is unmaintained, unsafe by design, and has known security issues

Critical

High

Medium

Low

Unknown

Security report (Trivy) · image mattermost 11.11.1

Install the chart

Deploy to Kubernetes with hardened defaults. The chart pins its image by signed digest, so you never track it yourself.

Install (latest)

helm install my-mattermost oci://ghcr.io/quenchworks/charts/mattermost --version 0.0.33

Deploys images (digest-pinned)

mattermost11.11.1
A
ghcr.io/quenchworks/images/mattermost@sha256:f89a620c9e6dc3d423ea979d4e5288bf5183a2df3fc422f0d7b53486eba534c7
postgresql18.6
A+
ghcr.io/quenchworks/images/postgresql@sha256:e3b4a823a4eb9f6863a0f87b2cd6b2d710f0f5977372b4161873d1861c180655

Chart version: 0.0.33
App version: 11.11.1
Chart license: AGPL-3.0-only
App license: AGPL-3.0
Service port: 8065
Signed: cosign (keyless)
Values schema: yes
Last published: 2026-10-11

Verify the chart

cosign verify ghcr.io/quenchworks/charts/mattermost:0.0.33 \
  --certificate-identity-regexp 'https://github.com/quenchworks/.+' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com

Transparency

The chart publishes its attestations on GitHub and the image it deploys carries its own on the same digest, publicly verifiable with the commands above. Both log to the Sigstore transparency log (Rekor), which cosign verify checks for you.

View the image View on ArtifactHub Chart source

Upstream project: https://mattermost.com