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AlienVault OTX Malware

esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a Local File Inclusion (LFI) issue was identified in the esm.sh service URL handling. An attacker could craft a request that causes the server to read and return files from the host filesystem (or other unintended file sources).

CVE-2025-59341 is a high-severity vulnerability classified under CWE-23 (Relative Path Traversal) affecting esm.sh, a no-build content delivery network (CDN) service used in modern web development. Versions up to and including 136 of esm.sh are vulnerable. The flaw arises from improper sanitization of user-supplied input in the URL handling logic of the esm.sh service, allowing an attacker to craft malicious requests that exploit relative path traversal sequences (e.g., '../') to access files outside the intended directory scope. This results in a Local File Inclusion (LFI) vulnerability where the server reads and returns arbitrary files from its host filesystem or other unintended file sources. The vulnerability does not require authentication or user interaction and can be exploited remotely over the network. The CVSS 4.0 base score of 7.7 reflects the ease of exploitation (network vector, low attack complexity), no privileges or user interaction required, and a high impact on confidentiality due to unauthorized disclosure of sensitive files. However, integrity and availability impacts are not present. No known exploits are currently reported in the wild, but the vulnerability's nature and severity suggest it could be leveraged for information disclosure, reconnaissance, or further attacks such as privilege escalation if sensitive configuration or credential files are exposed. The lack of available patches at the time of reporting increases the urgency for mitigation and monitoring. Given esm.sh's role as a CDN for web development, compromised instances could expose source code, environment variables, or other sensitive data critical to web applications relying on this service.

Detailed information about CVE-2025-59341: CWE-23: Relative Path Traversal in esm-dev esm.sh affecting esm-dev esm.sh. Get real-time updates, technical details,

CVE-2025-59341: CWE-23: Relative Path Traversal in esm-dev esm.sh - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-59341: CWE-23: Relative Path Traversal in esm-dev esm.sh

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