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CVE-2025-59835

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Date: October 2, 2025

LangBot is a global IM bot platform designed for LLMs. In versions 4.1.0 up to but not including 4.3.5, authorized attackers can exploit the /api/v1/files/documents interface to perform arbitrary file uploads. Since this interface does not strictly restrict the storage directory of files on the server, it is possible to upload dangerous files to specific system directories. This is fixed in version 4.3.5.

Severity Score

Related Resources (5)

https://github.com/langbot-app/LangBot/security/advisories/GHSA-7j3j-qj83-9qv4
https://nvd.nist.gov/vuln/detail/CVE-2025-59835
https://github.com/langbot-app/LangBot/releases/tag/v4.3.5
https://github.com/langbot-app/LangBot/pull/1691
https://www.mend.io/vulnerability-database/CVE-2025-59835

Severity Score

Weakness Type (CWE)

Unrestricted Upload of File with Dangerous Type

CWE-434

Relative Path Traversal

CWE-23

Top Fix

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Upgrade Version

Upgrade to version langbot - 4.5.1;https://github.com/langbot-app/LangBot.git - v4.3.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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