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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.

PUBLISHED Reserved 2026-05-05 | Published 2026-05-05 | Updated 2026-05-05 | Assigner VulDB




LOW: 2.1CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
LOW: 2.6CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
LOW: 2.6CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
1.4AV:A/AC:H/Au:S/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Time-of-check Time-of-use

Race Condition

Product status

0.3.1.0
affected

0.3.1.1
affected

0.3.1.2
affected

0.3.1.3
affected

Timeline

2026-05-05:Advisory disclosed
2026-05-05:VulDB entry created
2026-05-05:VulDB entry last update

Credits

Dem00 (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/361125 (VDB-361125 | chatchat-space Langchain-Chatchat OpenAI-Compatible File Upload API openai_routes.py files toctou) vdb-entry technical-description

vuldb.com/vuln/361125/cti (VDB-361125 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/807795 (Submit #807795 | chatchat-space Langchain-Chatchat 0.3.1.3 TOCTOU Race Condition / CWE-367) third-party-advisory

github.com/chatchat-space/Langchain-Chatchat/issues/5463 issue-tracking

github.com/...chain-Chatchat/Vuln-2-Silent-File-Overwrite.md exploit

github.com/chatchat-space/Langchain-Chatchat/ product

cve.org (CVE-2026-7846)

nvd.nist.gov (CVE-2026-7846)

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