CVE-2025-6854Public exploitNetwork attack vector

Authenticated file disclosure via unchecked decoded path

Published Jun 29, 2025 · Updated Jun 30, 2025

Path traversal in Langchain-Chatchat 0.3.1 and earlier allows remote authenticated users to read arbitrary server files. The _get_file_path function base64-decodes the user-supplied file_id, joins the decoded path without validating its resolved location, and returns the resulting file. Low-privileged access to the files API is sufficient to disclose files readable by the service account, including configuration data.

CVSS severity4.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Langchain-Chatchat 0.3.1 and earlier allows remote authenticated users to read arbitrary server files. The _get_file_path function base64-decodes the user-supplied file_id, joins the decoded path without validating its resolved location, and returns the resulting file. Low-privileged access to the files API is sufficient to disclose files readable by the service account, including configuration data.

The record

CVE
CVE-2025-6854
Published
Jun 29, 2025
Updated
Jun 30, 2025
Vendor
Chatchat-Space
Product
Langchain-Chatchat
Classifications
CWE-22, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.3.0
  2. Affected versionversion=0.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chatchat-Space · Langchain-Chatchatversion=0.3.0; version=0.3.1

Published CVSS scores

4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0VulDBAV:N/AC:L/Au:S/C:P/I:N/A:N
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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