High 8.6Published Oct 2, 2025

CVE-2025-59835LangBot has a cross-directory file upload vulnerability, which could lead to system takeover

Updated under an hour ago (Oct 27, 2026, 5:40 PM ET)

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It affects langbot-app LangBot. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for langbot-app LangBot

Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Weakness (CWE): CWE-23, CWE-434
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 2, 2025
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

langbot-app LangBot langbot_app:langbot (from the name)	from 4.1.0, < 4.3.5	CNA record

References

References

https://github.com/langbot-app/LangBot/security/advisories/GHSA-7j3j-qj83-9qv4	x-refsource-confirm
https://github.com/langbot-app/LangBot/pull/1691	x-refsource-misc
https://github.com/langbot-app/LangBot/releases/tag/v4.3.5	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.