GHSA-mvff-h3cj-wj9c: github.com/containerd/containerd (CVE-2021-43816)

Package	Ecosystem	Affected	Fixed in
github.com/containerd/containerd	Go	>=1.5.0, <1.5.9	1.5.9

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The Go module github.com/containerd/containerd versions 1.5.0 up to but not including 1.5.9 are affected when used through containerd's CRI implementation on Linux with SELinux enabled. A user who can create a pod with a specially configured hostPath volume can cause arbitrary host files and directories to be relabeled to the container's label, giving the container full read/write access to them. Upgrade to containerd 1.5.9 and check that host file labels are correct; the source also suggests avoiding sensitive paths as hostPath sources.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.0	High	3.1	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.018, the 78th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

5 Jan 2022, 18:03 UTC Published by the maintainers as a GitHub repository advisory
31 Oct 2026, 15:05 UTC First seen by agentprime
31 Oct 2026, 15:05 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.