PYSEC-2026-2557

Vulnerability from pysec - Published: 2026-07-13 15:15 - Updated: 2026-07-13 16:04
VLAI
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.

Severity
2.6 (Low)
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
1.2 (Low)
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
Impacted products
Name purl
langchain-chatchat pkg:pypi/langchain-chatchat
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "langchain-chatchat",
        "purl": "pkg:pypi/langchain-chatchat"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.3.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7847",
    "GHSA-jv4p-mhmp-69vw"
  ],
  "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\u0027s 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.",
  "id": "PYSEC-2026-2557",
  "modified": "2026-07-13T16:04:29.140833Z",
  "published": "2026-07-13T15:15:37.148349Z",
  "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": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Langchain-Chatchat Uses Insufficiently Random Values"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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