CVE-2026-101132 in deepseek-harness
Summary
by MITRE • 09/28/2026
A security flaw has been discovered in DeepSeek deepseek-harness up to 0.1.7-rc.2. The affected element is the function loadProfile of the file packages/boot/app-boot/src/profile.ts of the component Bundle Patch Handler. The manipulation of the argument dsh.bundle.patch results in path traversal. The attack may be performed from remote. The attack requires a high level of complexity. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/28/2026
A critical security vulnerability has been identified within the DeepSeek deepseek-harness software, specifically affecting versions up to 0.1.7-rc.2. This flaw resides in the Bundle Patch Handler component and is triggered by improper input validation of the dsh.bundle.patch argument passed to the loadProfile function located in packages/boot/app-boot/src/profile.ts. The core technical issue is a path traversal vulnerability, which allows an attacker to manipulate file system paths through specially crafted inputs that bypass intended directory restrictions. This type of flaw typically arises when software constructs file or directory names from user-supplied input without sufficiently neutralizing special elements such as dot-dot-slash sequences. By exploiting this weakness, an adversary can read arbitrary files on the host system or potentially write malicious content to unintended locations, depending on the permissions under which the application runs.
The operational impact of this vulnerability is significant due to its remote exploitability. Although the attack requires a high level of complexity and is described as difficult to execute successfully in practice, the fact that an exploit has already been released publicly increases the risk landscape considerably. Attackers with sufficient technical expertise can leverage this flaw to gain unauthorized access to sensitive system files, leading to potential data exfiltration or further compromise of the underlying infrastructure. The lack of response from the vendor since early contact suggests a gap in security communication and patch management processes, leaving users exposed until an official fix is provided. This situation underscores the importance of proactive vulnerability monitoring and defensive coding practices even when vendors are unresponsive.
From a classification perspective, this issue aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which covers cases where software does not properly validate input before using it in file system operations. Additionally, the exploitation technique relates to ATT&CK T1083: File and Directory Discovery, as path traversal is often used to enumerate or access restricted files for subsequent attacks such as data staging or privilege escalation. To mitigate this risk, immediate actions should include restricting network exposure of affected components if possible, implementing strict input validation that rejects any non-alphanumeric characters in patch identifiers, and applying principle of least privilege to the application runtime environment. Organizations relying on deepseek-harness should monitor for official patches from DeepSeek and consider temporary workarounds such as web application firewall rules designed to block path traversal sequences like ../ or ..\ in HTTP requests targeting the affected endpoint until a permanent solution is deployed.