PT-2026-37083 · Unknown · Langchain-Chatchat

Dem00 · Published 2026-05-05 · Updated 2026-05-05 · CVE-2026-7846

Positive Technologies (AI Summary)

CVSS v3.1

2.6

Low

Base vector

AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Langchain-Chatchat versions prior to 0.3.1.4

Description A time-of-check time-of-use (TOCTOU) issue exists in the OpenAI-Compatible File Upload API component. Manipulation of the file.filename argument within the files() function located in the libs/chatchat-server/chatchat/server/api server/openai routes.py file can be exploited. Successful exploitation requires local network access and is characterized by high complexity.

Recommendations As a temporary workaround, restrict access to the files() function in the libs/chatchat-server/chatchat/server/api server/openai routes.py file to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Race Condition

Time Of Check To Time Of Use

Weakness Enumeration

CWE-362

CWE-367

Related Identifiers

CVE-2026-7846

GHSA-X229-W2J4-H748

Affected Products

Langchain-Chatchat

References · 10

• 🔥 https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwrite.md · Exploit
• https://osv.dev/vulnerability/GHSA-x229-w2j4-h748 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-7846 · Security Note
• https://github.com/chatchat-space/Langchain-Chatchat · Note
• https://github.com/chatchat-space/Langchain-Chatchat/issues/5463 · Note
• https://t.me/CVEtracker/52766 · Telegram Post
• https://t.me/cveNotify/162236 · Telegram Post
• https://vuldb.com/vuln/361125/cti · Note
• https://vuldb.com/submit/807795 · Note
• https://vuldb.com/vuln/361125 · Note