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Vulnerability · Published May 5, 2026 · Assigned by VulDB

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

Low 2.6

In plain English

A low-severity race condition in Langchain-Chatchat from chatchat-space. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)2.6Low
Exploit odds (30 days)0.2%top 94.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIlangchain-chatchatno fix listedGHSA-x229-w2j4-h748
PyPIlangchain-chatchatno fix listedPYSEC-2026-2559

Affected products (as reported)

VendorProductVersions
chatchat-space Langchain-Chatchat 0.3.1.00.3.1.10.3.1.20.3.1.3

Weakness: CWE-367, CWE-362 · Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References