CVE-2025-59342 (GCVE-0-2025-59342)
Vulnerability from cvelistv5 – Published: 2025-09-17 17:59 – Updated: 2026-01-14 15:52
VLAI
EPSS
VEX
Title
esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header
Summary
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.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-17 18:19 UTC
CWE
- CWE-24 - Path Traversal: '../filedir'
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/esm-dev/esm.sh/security/adviso… | x_refsource_CONFIRM |
| https://github.com/esm-dev/esm.sh/commit/833a29f4… | x_refsource_MISC |
| https://github.com/esm-dev/esm.sh/blob/main/serve… | x_refsource_MISC |
| https://github.com/esm-dev/esm.sh/blob/main/serve… | x_refsource_MISC |
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