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Vulnerabilities

Security fix · CVE-2025-59835

LangBot is a global IM bot platform designed for LLMs.

Published Oct 2, 2025 · catalog updated Oct 2, 2025 · LangBot

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59835. EPSS is 0.42%. Act only if a listed version of LangBot is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.42%
Remediation
Version ranges on file
Affected products
vendor langbot-app LangBot 4.1.0, < 4.3.5

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor langbot-app LangBot 4.1.0, < 4.3.54.1.0, < 4.3.5

How to fix CVE-2025-59835

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59835. EPSS is 0.42%. Act only if a listed version of LangBot is installed.

Which versions are affected?

Compare what you have installed with langbot-app LangBot 4.1.0, < 4.3.5 4.1.0, < 4.3.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 2, 2025 · EUVD

    Detected

    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 versio

  2. Oct 2, 2025 · EUVD

    Updated

    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 versio

Sources

  • CVE.orgVulnerability recordCVE-2025-59835

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59835

    30-day exploitation probability 0.42%

    first.org
  • EUVDVulnerability recordEUVD-2025-33219

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 1, 2026
  • CVE.orgOct 23, 2026
  • EUVDOct 23, 2026