Description
esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories. Version 136.1 contains a patch.
Published: 2025-09-17
Score: 5.5 Medium
EPSS: 6.4% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2025-29764 esm.sh has arbitrary file write via path traversal in `X-Zone-Id` header
Github GHSA Github GHSA GHSA-g2h5-cvvr-7gmw esm.sh has arbitrary file write via path traversal in `X-Zone-Id` header
History

Wed, 14 Jan 2026 16:00:00 +0000

Type Values Removed Values Added
Description esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories. esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories. Version 136.1 contains a patch.
References

Thu, 18 Sep 2025 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Esm-dev
Esm-dev esmsh
Vendors & Products Esm-dev
Esm-dev esmsh

Wed, 17 Sep 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 17 Sep 2025 18:15:00 +0000

Type Values Removed Values Added
Description esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories.
Title esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header
Weaknesses CWE-24
References
Metrics cvssV4_0

{'score': 5.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}

Subscriptions

Esm-dev Esmsh
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-14T15:52:09.174Z

Reserved: 2025-09-12T12:36:24.636Z

Link: CVE-2025-59342

cve-icon Vulnrichment

Updated: 2025-09-17T18:19:58.868Z

cve-icon NVD

Status : Deferred

Published: 2025-09-17T18:15:53.550

Modified: 2026-04-15T00:35:42.020

Link: CVE-2025-59342

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-09-18T12:41:20Z

Weaknesses