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CVE-2026-7846— chatchat-space Langchain-Chatchat OpenAI-Compatible File Upload API openai_routes.py files toctou

Quick assessment

Affected
chatchat-space Langchain-Chatchat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangChain-Chatchat是Chatchat-Space开源的一个基于LangChain框架开发的聊天机器人软件。 Langchain-Chatchat 0.3.1.3及之前版本存在竞争条件问题漏洞，该漏洞源于OpenAI-Compatible File Upload API组件中文件libs/chatchat-server/chatchat/server/api_server/openai_routes.py的函数files对参数file.filename的操作导致检查时间与使用时间问题，可能

CVSS 2.6 · Low EPSS 0.23% · P13

Affected Version Matrix 4

VendorProduct Version RangeStatus
chatchat-space Langchain-Chatchat 0.3.1.0 affected
0.3.1.1 affected
0.3.1.2 affected
0.3.1.3 affected
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I. Basic Information for CVE-2026-7846

Vulnerability Information
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Vulnerability Title
chatchat-space Langchain-Chatchat OpenAI-Compatible File Upload API openai_routes.py files toctou
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in chatchat-space Langchain-Chatchat up to 0.3.1.3. Impacted is the function files of the file libs/chatchat-server/chatchat/server/api_server/openai_routes.py of the component OpenAI-Compatible File Upload API. Such manipulation of the argument file.filename leads to time-of-check time-of-use. Access to the local network is required for this attack to succeed. The attack requires a high level of complexity. The exploitability is considered difficult. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
LangChain-Chatchat 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain-Chatchat是Chatchat-Space开源的一个基于LangChain框架开发的聊天机器人软件。 Langchain-Chatchat 0.3.1.3及之前版本存在竞争条件问题漏洞，该漏洞源于OpenAI-Compatible File Upload API组件中文件libs/chatchat-server/chatchat/server/api_server/openai_routes.py的函数files对参数file.filename的操作导致检查时间与使用时间问题，可能
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
chatchat-space Langchain-Chatchat 0.3.1.0 -

II. Public POCs for CVE-2026-7846

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III. Intelligence Information for CVE-2026-7846

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Vendor Advisories for CVE-2026-7846 (1)

Vendor Pages for CVE-2026-7846 (1)

Other References for CVE-2026-7846 (1)

Same Patch Batch · chatchat-space · 2026-05-05 · 4 CVEs total

CVE-2026-7844 6.3 MEDIUM chatchat-space Langchain-Chatchat Compatible File Service openai_routes.py delete_file mis
CVE-2026-7845 2.6 LOW chatchat-space Langchain-Chatchat Vision Chat Paste Image dialogue.py PIL.Image.tobytes we
CVE-2026-7847 2.6 LOW chatchat-space Langchain-Chatchat Uploaded File openai_routes.py _get_file_id random value

IV. Related Vulnerabilities

Same product: Langchain-Chatchat
Same vendor: chatchat-space
Same weakness: CWE-367

V. Comments for CVE-2026-7846

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