CVE-2026-23644
January 18, 2026
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.
Affected Packages
github.com/esm-dev/esm.sh (GO):
Affected version(s) >=v0.0.0-20240514002037-19735e27aaf9 <v0.0.0-20260116051925-c62ab83c589eFix Suggestion:
Update to version v0.0.0-20260116051925-c62ab83c589egithub.com/esm-dev/esm.sh (GO):
Affected version(s) >=v0.0.0-20240514002037-19735e27aaf9 <v0.0.0-20260116051925-c62ab83c589eFix Suggestion:
Update to version v0.0.0-20260116051925-c62ab83c589eRelated Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
Exploit Maturity
POC
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
EPSS
Base Score:
0.07
