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CVE-2025-59342

Date: September 17, 2025

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.

Severity Score

Related Resources (8)

https://github.com/esm-dev/esm.sh/commit/833a29f42aeb0acbd7089a71be11dd0a292d3151
https://nvd.nist.gov/vuln/detail/CVE-2025-59342
https://github.com/esm-dev/esm.sh/security/advisories/GHSA-g2h5-cvvr-7gmw
https://github.com/esm-dev/esm.sh
https://github.com/esm-dev/esm.sh/blob/main/server/router.go#L411
https://pkg.go.dev/vuln/GO-2025-3967
https://github.com/esm-dev/esm.sh/blob/main/server/router.go#L116
https://www.mend.io/vulnerability-database/CVE-2025-59342

Severity Score

Weakness Type (CWE)

Path Traversal: '../filedir'

CWE-24

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

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