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CVE-2026-35454 is a low severity vulnerability with a CVSS score of 0.0. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
A 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.
ExtractZip passed the raw, attacker-controlled zf.Name to a caller-supplied callback:
return false, fn(zf.Name, zr) // zf.Name not sanitized
AddExtension constructed the output path with filepath.Join and no boundary check:
path := filepath.Join(dir, name) // zip loop
path := filepath.Join(dir, file.RelativePath) // extra files loop
filepath.Clean resolved .. lexically but did not confine the result to dir:
filepath.Join("/srv/ext/pub/1.0", "../../../../etc/cron.d/evil")
→ "/etc/cron.d/evil"
An authenticated user (any upload-capable role) would submit a VSIX containing path-traversal entries.
On 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.
Addressed in https://github.com/coder/code-marketplace/releases/tag/v2.4.2
Coder would like to thank Kandlaguduru Vamsi for responsibly disclosing this issue in accordance with https://coder.com/security/policy
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