CVE-2026-35454: Code Extension Marketplace Path Traversal Vulnerability
HIGHCVE-2026-35454 is a HIGH path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Code Extension Marketplace libraries in the Go ecosystem. The issue involves zip slip path traversal. Remediation is available by upgrading affected packages to version 1.2.3-0.20260402184705-988440dee05f.
CVE-2026-35454 at a Glance
How to Fix CVE-2026-35454
To remediate this vulnerability, upgrade all affected Code Extension Marketplace dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/coder/code-marketplace to 1.2.3-0.20260402184705-988440dee05fRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/coder/code-marketplaceHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-35454, inspect your project dependencies for Code Extension Marketplace:
inspect dependencies for github.com/coder/code-marketplaceAnalyze the terminal output to locate any version of Code Extension Marketplace in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.3-0.20260402184705-988440dee05f), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Code Extension Marketplace, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-35454 Affected Code Extension Marketplace Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/coder/code-marketplace
|
Go |
< 1.2.3-0.20260402184705-988440dee05f
|
1.2.3-0.20260402184705-988440dee05f
|
References
Frequently Asked Questions
What is CVE-2026-35454?
Which Code Extension Marketplace versions are affected?
What version fixes CVE-2026-35454?
Is github.com/coder/code-marketplace affected?
What CWE is associated with CVE-2026-35454?
How can I check Go dependencies for CVE-2026-35454?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-8x9r-hvwg-c55h",
"modified" : "2026-04-07T14:21:34Z",
"published" : "2026-04-04T06:26:02Z",
"aliases" : [ "CVE-2026-35454" ],
"summary" : "Code Extension Marketplace: Zip Slip Path Traversal",
"details" : "# Zip Slip Path Traversal in coder/code-marketplace\n\n## Summary\n\nA Zip Slip (CWE-22) vulnerability in `coder/code-marketplace` ≤ v2.4.1 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.\n\n\n## Root Cause\n\n`ExtractZip` passed the raw, attacker-controlled `zf.Name` to a caller-supplied callback:\n\n```go\nreturn false, fn(zf.Name, zr) // zf.Name not sanitized\n```\n\n`AddExtension` constructed the output path with `filepath.Join` and no boundary check:\n\n```go\npath := filepath.Join(dir, name) // zip loop\npath := filepath.Join(dir, file.RelativePath) // extra files loop\n```\n\n`filepath.Clean` resolved `..` lexically but did not confine the result to `dir`:\n\n```\nfilepath.Join(\"/srv/ext/pub/1.0\", \"../../../../etc/cron.d/evil\")\n → \"/etc/cron.d/evil\"\n```\n\n## Attack Scenario\n\nAn authenticated user (any upload-capable role) would submit a VSIX containing path-traversal entries.\n\nOn extraction, files would land at attacker-chosen paths writable by the marketplace process, enabling persistence (cron/init injection), SSH key injection, `ld.so.preload` hijacking, or binary overwrite depending on process privileges.\n\n## Fix\n\nAddressed in https://github.com/coder/code-marketplace/releases/tag/v2.4.2\n\n## Recognition\nCoder would like to thank [Kandlaguduru Vamsi](https://www.linkedin.com/in/vamsi-k-5419632a9/) for responsibly disclosing this issue in accordance with https://coder.com/security/policy",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/coder/code-marketplace"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.2.3-0.20260402184705-988440dee05f"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/coder/code-marketplace/security/advisories/GHSA-8x9r-hvwg-c55h"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35454"
}, {
"type" : "WEB",
"url" : "https://github.com/coder/code-marketplace/commit/988440dee05fceef8400ed725badc604dbf90792"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/coder/code-marketplace"
}, {
"type" : "WEB",
"url" : "https://github.com/coder/code-marketplace/releases/tag/v2.4.2"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-04-04T06:26:02Z",
"nvd_published_at" : "2026-04-06T22:16:23Z"
}
}