Vulnerability in Chatchat-Space Langchain-Chatchat
CVE-2026-7846
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 2.6 (Low). Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Chatchat-Space Langchain-Chatchat — versions 0.3.1.0, 0.3.1.1, 0.3.1.2
Weakness classification (CWE)
References
- github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwr… (exploit)
- github.com/chatchat-space/Langchain-Chatchat/ (product)
- github.com/chatchat-space/Langchain-Chatchat/issues/5463 (issue-tracking)
- vuldb.com/submit/807795 (third-party-advisory)
- vuldb.com/vuln/361125 (technical-description, vdb-entry)
- vuldb.com/vuln/361125/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-7846?
- CVE-2026-7846 is a low-severity vulnerability in Chatchat-Space Langchain-Chatchat, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 2.6/10. Published 2026-05-05.
- How severe is CVE-2026-7846?
- Low severity. CVSS v3 base score is 2.6 out of 10.