CVE-2026-23644
HIGH
GHSA-2657-3c98-63jq
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4Tags
Description
esm.sh is a no-build content delivery network (CDN) for web development. Prior to Go pseeudoversion 0.0.0-20260116051925-c62ab83c589e, the software has a path traversal vulnerability due to an incomplete fix. `path.Clean` normalizes a path but does not prevent absolute paths in a malicious tar file. Commit https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16, corresponding to pseudoversion 0.0.0-20260116051925-c62ab83c589e, fixes this issue.
Analysis
Path traversal in esm.sh CDN prior to version 0.0.0-20260116051925-c62ab83c589e allows unauthenticated remote attackers to write arbitrary files to the server through malicious tar archives, bypassing incomplete path sanitization. Public exploit code exists for this vulnerability. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Review file handling controls and restrict upload directories.
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External POC / Exploit Code
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