mattermost

Chart · Messaging · standard · v0.0.20

digest pinnedcosign signedSPDX SBOMSLSA provenanceamd64 · arm64Rebuilt 2026-09-06

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

0.0.20 · latest 0.0.19 0.0.18

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

sha256:64b7d095520772ad16fa0cd4bbf0df097398829c26cf9cbc87aed2287064ca2d

Chart OCI version

oci://ghcr.io/quenchworks/charts/mattermost:0.0.20

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

408.1 MB

Security report (Trivy)

C· 69/1003 fixable · rebuild clears them

Vulnerability detail

mattermost 11.10.1 · 4 CVE

CVE	Severity	Package	Installed	Fixed in	Title
CVE-2026-18374	MEDIUM	glibc-2.44	2.44-r5	2.44-r6	glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string
CVE-2026-18374	MEDIUM	glibc-2.44-locale-posix	2.44-r5	2.44-r6	glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string
CVE-2026-18374	MEDIUM	ld-linux-2.44	2.44-r5	2.44-r6	glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string
GO-2026-5932	UNKNOWN	golang.org/x/crypto	v0.56.0	— 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 11.10.1

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 0.0.20

Deploys image (digest-pinned)

ghcr.io/quenchworks/images/mattermost@sha256:64b7d095520772ad16fa0cd4bbf0df097398829c26cf9cbc87aed2287064ca2d
ghcr.io/quenchworks/images/postgresql@sha256:919b69c5c86b3a2a454bbe50a24d9d33feb73441bb0d466e583bc3e1a78ac77b

Chart version: 0.0.20
App version: 11.10.1
Chart license: AGPL-3.0-only
App license: AGPL-3.0
Service port: 8065
Signed: cosign (keyless)
Values schema: yes
Last published: 2026-08-31

Verify the chart

cosign verify ghcr.io/quenchworks/charts/mattermost:0.0.20 \
  --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