CVE-2026-67185
Received Received - Intake

Path Traversal Vulnerability in TinyWeb

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: VulnCheck

Description
TinyWeb through 0.0.8 contains a path traversal vulnerability that allows unauthenticated attackers to read arbitrary files by submitting ../ sequences in the URL path, which are concatenated directly to the configured web root in HttpBuilder::buildResponse() without normalization, dot-segment removal, or boundary checks. Attackers can craft a single request with ../ sequences that pass through the URL parser unchanged and reach the filesystem call via HttpFile::setFile(), exposing sensitive files such as credential stores and private keys when the server process runs as root.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-67185
EUVD
EUVD-2026-49904

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

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Executive Summary

TinyWeb through version 0.0.8 has a path traversal vulnerability where unauthenticated attackers can read arbitrary files by inserting ../ sequences in the URL path. The application directly concatenates these sequences to the web root without normalization or boundary checks, allowing filesystem access outside intended directories. This flaw exists in the HttpBuilder::buildResponse() function and can expose sensitive files like credential stores or private keys if the server runs as root.

Detection Guidance

To detect this vulnerability, check if TinyWeb version 0.0.8 is running on your system. Use commands like 'curl --path-as-is http://TARGET:9090/../../../../etc/passwd' to test for path traversal. If the server responds with file contents, it is vulnerable.

Impact Analysis

This vulnerability allows attackers to read sensitive files on the server, including configuration files, credentials, or private keys. If the server runs as root, attackers could access critical system files like /etc/passwd or other protected resources. Exploitation requires no authentication or user interaction, making it easy to abuse remotely.

Compliance Impact

This vulnerability could lead to data breaches, exposing sensitive user or system data. For GDPR, this may result in unauthorized access to personal data, violating confidentiality requirements. For HIPAA, it could expose protected health information, leading to compliance violations. Both standards require safeguards against unauthorized data access.

Mitigation Strategies

Immediately update TinyWeb to a patched version if available. If no patch exists, restrict access to the server, disable root privileges, and implement path normalization in the code to prevent ../ sequences from escaping the web root.

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