id: PYSEC-2026-2557
published: "2026-07-13T15:15:37.148349Z"
modified: "2026-07-13T16:04:29.140833Z"
aliases:
- CVE-2026-7847
- GHSA-jv4p-mhmp-69vw
summary: Langchain-Chatchat Uses Insufficiently Random Values
details: A vulnerability was found in chatchat-space Langchain-Chatchat up to 0.3.1.3. The affected element is the function _get_file_id of the file libs/chatchat-server/chatchat/server/api_server/openai_routes.py of the component Uploaded File Handler. Performing a manipulation results in insufficiently random values. Access to the local network is required for this attack. The attack's complexity is rated as high. The exploitability is described as difficult. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.
affected:
- package:
    name: langchain-chatchat
    ecosystem: PyPI
    purl: pkg:pypi/langchain-chatchat
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - last_affected: 0.3.1.3
  versions:
  - 0.3.0
  - 0.3.0.20240506
  - 0.3.0.20240606
  - 0.3.0.20240610
  - 0.3.0.20240610.1
  - 0.3.0.20240611
  - 0.3.0.20240612
  - 0.3.0.20240612.1
  - 0.3.0.20240612.2
  - 0.3.0.20240612.3
  - 0.3.0.20240612.4
  - 0.3.0.20240616
  - 0.3.0.20240618
  - 0.3.0.20240619
  - 0.3.0.20240621
  - 0.3.0.20240621.3
  - 0.3.0.20240625
  - 0.3.0.20240625.1
  - 0.3.1
  - 0.3.1.1
  - 0.3.1.2
  - 0.3.1.3
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-7847
- type: WEB
  url: https://github.com/chatchat-space/Langchain-Chatchat/issues/5464
- type: WEB
  url: https://github.com/3em0/cve_repo/blob/main/Langchain-Chatchat/Vuln-3-Predictable-File-ID.md
- type: PACKAGE
  url: https://github.com/chatchat-space/Langchain-Chatchat
- type: WEB
  url: https://vuldb.com/submit/807796
- type: WEB
  url: https://vuldb.com/vuln/361126
- type: WEB
  url: https://vuldb.com/vuln/361126/cti
- type: PACKAGE
  url: https://pypi.org/project/langchain-chatchat
- type: ADVISORY
  url: https://github.com/advisories/GHSA-jv4p-mhmp-69vw
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- type: CVSS_V4
  score: CVSS:4.0/AV:A/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P