Vulnerability details

CVE-2026-23644

esm-dev esm.sh

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

CVSS 4.0

7.7High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.7High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
esm-dev	esm.sh	< 0.0.0-20260116051925-c62ab83c589e	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/esm-dev/esm.sh/security/advisories/GHSA-2657-3c98-63jq x_refsource_CONFIRM
https://github.com/esm-dev/esm.sh/commit/9d77b88c320733ff6689d938d85d246a3af9af16 x_refsource_MISC
https://github.com/esm-dev/esm.sh/commit/c62ab83c589e7b421a0e1376d2a00a4e48161093 x_refsource_MISC
https://pkg.go.dev/vuln/GO-2025-4138 x_refsource_MISC

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Details

Published: 2026-01-19
Last updated: 2026-01-20
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.56%

Probability of exploitation in 30 days

46.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')