High 7.7Published Jan 18, 2026

CVE-2026-23644esm.sh has path traversal in `extractPackageTarball` that enables file writes from malicious packages

Updated under an hour ago (Oct 26, 2026, 6:50 PM ET)

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It affects esm-dev esm.sh and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for esm-dev esm.sh

Exploited in the last 30 days

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.

CVSS: 7.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jan 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

esm-dev esm.sh esm_dev:esm.sh (from the name)	before 0.0.0-20260116051925-c62ab83c589e	CNA record
esm esm.sh esm:esm.sh	before 136	NVD

References

References

https://github.com/esm-dev/esm.sh/security/advisories/GHSA-2657-3c98-63jq	x-refsource-confirm, vendor-advisory
https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16	x-refsource-misc, patch
https://github.com/esm-dev/esm.sh/commit/c62ab83c589e7b421a0e1376d2a00a4e48161093	x-refsource-misc, patch
https://pkg.go.dev/vuln/GO-2025-4138	x-refsource-misc, exploit, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.