CVE-2026-7846: Time-of-check Time-of-use in chatchat-space Langchain-Chatchat
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.
AI Analysis
Technical Summary
This vulnerability affects the OpenAI-Compatible File Upload API in chatchat-space Langchain-Chatchat up to version 0.3.1.3. It involves a TOCTOU race condition triggered by manipulation of the file.filename argument, potentially allowing an attacker with local network access to exploit the timing discrepancy between checking and using the filename. The attack complexity is high, and no official remediation or patch has been released as of the publication date.
Potential Impact
The vulnerability could allow an attacker with local network access to exploit a race condition in file handling, potentially leading to unintended behavior or security issues related to file uploads. However, the low CVSS score (2.1) and the requirement for local network access and high attack complexity limit the practical impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
No official fix or patch is currently available, and the vendor has not responded to the issue report. Users should monitor the vendor's communications for updates. Given the attack complexity and required local network access, restricting network access to trusted users and environments may reduce exposure. Patch status is not yet confirmed—check the vendor advisory for current remediation guidance.
CVE-2026-7846: Time-of-check Time-of-use in chatchat-space Langchain-Chatchat
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the OpenAI-Compatible File Upload API in chatchat-space Langchain-Chatchat up to version 0.3.1.3. It involves a TOCTOU race condition triggered by manipulation of the file.filename argument, potentially allowing an attacker with local network access to exploit the timing discrepancy between checking and using the filename. The attack complexity is high, and no official remediation or patch has been released as of the publication date.
Potential Impact
The vulnerability could allow an attacker with local network access to exploit a race condition in file handling, potentially leading to unintended behavior or security issues related to file uploads. However, the low CVSS score (2.1) and the requirement for local network access and high attack complexity limit the practical impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
No official fix or patch is currently available, and the vendor has not responded to the issue report. Users should monitor the vendor's communications for updates. Given the attack complexity and required local network access, restricting network access to trusted users and environments may reduce exposure. Patch status is not yet confirmed—check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-05-05T10:20:56.988Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fa1920cbff5d86100ff74e
Added to database: 5/5/2026, 4:21:52 PM
Last enriched: 5/5/2026, 4:37:31 PM
Last updated: 5/5/2026, 7:16:46 PM
Views: 4
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