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CVE-2025-59342

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.

POC

Reference

- https://github.com/esm-dev/esm.sh/security/advisories/GHSA-g2h5-cvvr-7gmw

Github

- https://github.com/PuddinCat/GithubRepoSpider

- https://github.com/byteReaper77/CVE-2025-59342

- https://github.com/fkie-cad/nvd-json-data-feeds

- https://github.com/nomi-sec/PoC-in-GitHub