CVE-2026-7846

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 5.8% of scored records. A rank, not a probability.

NVD base score

1.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-07-24.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-05 16:00Z4 MO AGO

Last updated

2026-05-05 16:11Z4 MO AGO

Reserved

2026-05-05

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Low (CVSS 2.1)

CNA CVSS vector

CVSS: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

Weaknesses

• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class
• CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase

Data version

5.2

Document digest

a5558067fb976c4072fe3d4665fe52db1b8c66ab662be1bce6c404f6a3a8968b

• vuldb.comVDB-361125 | chatchat-space Langchain-Chatchat OpenAI-Compatible File Upload API openai_routes.py files toctouhttps://vuldb.com/vuln/361125vdb-entrytechnical-description
• vuldb.comVDB-361125 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/361125/ctisignaturepermissions-required
• vuldb.comSubmit #807795 | chatchat-space Langchain-Chatchat 0.3.1.3 TOCTOU Race Condition / CWE-367https://vuldb.com/submit/807795third-party-advisory
• github.comhttps://github.com/chatchat-space/Langchain-Chatchat/issues/5463issue-tracking
• github.comhttps://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-2-Silent-File-Overwrite.mdexploit
• github.comhttps://github.com/chatchat-space/Langchain-Chatchat/product