CVE-2026-88937 in knowns
Summary
by MITRE • 09/10/2026
knowns through 0.33.0 fails to properly validate template destination paths in the code generation template engine, allowing attackers to read and write arbitrary files outside the project root. Attackers can supply malicious templates that traverse directories to overwrite shell profiles, steal credentials, or achieve persistent code execution on victim systems.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified involves a critical path traversal flaw within the code generation template engine of the knowns software suite prior to version 0.33.0. This security defect stems from an insufficient validation mechanism for destination paths specified in user-supplied templates. When the application processes these templates, it fails to adequately sanitize or canonicalize file system paths before performing read and write operations. Consequently, attackers can manipulate path strings using standard directory traversal sequences, such as dot-dot-slash patterns, to escape the intended project root directory. This lack of strict boundary enforcement allows the template engine to interact with arbitrary locations on the underlying operating system's file structure rather than being confined to the designated output directories.
The operational impact of this vulnerability is severe due to its potential for both information disclosure and remote code execution. By exploiting the path traversal weakness, an attacker can read sensitive configuration files, source code repositories, or environment-specific secrets located outside the project scope. More critically, the ability to write arbitrary files enables malicious actors to overwrite system-critical configurations. For instance, targeting shell profile files such as .bashrc or .zshrc allows for the injection of persistent commands that execute upon user login. This capability facilitates credential theft by capturing input from interactive sessions and establishes a foothold for persistent code execution on victim systems without requiring direct access to executable binaries.
From a classification perspective, this vulnerability aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which describes flaws where software does not properly neutralize special elements within file paths that can cause the path to resolve outside of the intended directory. Furthermore, in the context of the MITRE ATT&CK framework, this behavior maps directly to T1059: Command and Scripting Interpreter for lateral movement or persistence via shell profile modification, as well as T1083: File and Directory Discovery when used for reconnaissance purposes. The exploitation chain typically involves crafting a malicious template payload that leverages the traversal sequences to reach sensitive system paths, thereby bypassing standard sandboxing expectations inherent in code generation tools.
Mitigation strategies must prioritize immediate patching of the knowns software to version 0.33.0 or later, where this validation logic has been corrected. In environments where upgrading is not immediately feasible, administrators should implement strict input validation at the application layer by rejecting any file paths containing relative traversal sequences before they are processed by the template engine. Additionally, deploying a web application firewall with rules capable of detecting and blocking directory traversal attempts can provide an additional layer of defense. It is also advisable to enforce least-privilege principles for the service account running the code generation process, ensuring that even if path validation fails, the operating system permissions restrict access to critical system directories such as home folders or configuration files containing credentials.