PYSEC-2026-2794

Vulnerability from pysec - Published: 2026-07-13 14:36 - Updated: 2026-07-13 16:05
VLAI
Details

Impact

The save_report tool in openchatbi/tool/save_report.py suffers from a critical path traversal vulnerability due to insufficient input sanitization of the file_format parameter.

The function only removes leading dots of file_format using file_format.lstrip(".") but allows path traversal sequences like /../../ to pass through unchanged. When the filename is constructed via string concatenation in 

f"{timestamp}_{clean_title}.{file_format}"

malicious path sequences are preserved, enabling attackers to write files outside the designated report directory.

An attacker can manipulate the LLM to call the tool with a specific file_format to overwrite critical system files like __init__.py, potentially leading to remote code execution.

Patches

  • Affected versions: <=0.2.1
  • Patched versions: 0.2.2 (includes fix from PR #12: https://github.com/zhongyu09/openchatbi/pull/12)

Workarounds

No

References

  • Issue #10: https://github.com/zhongyu09/openchatbi/issues/10
  • PR #12: https://github.com/zhongyu09/openchatbi/pull/12
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Impacted products
Name purl
openchatbi pkg:pypi/openchatbi
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "openchatbi",
        "purl": "pkg:pypi/openchatbi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.1",
        "0.1.0",
        "0.1.1",
        "0.2.0",
        "0.2.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28795",
    "GHSA-vmwq-8g8c-jm79"
  ],
  "details": "### Impact\nThe `save_report` tool in `openchatbi/tool/save_report.py` suffers from a critical path traversal vulnerability due to insufficient input sanitization of the `file_format` parameter. \n\nThe function only removes leading dots of `file_format` using `file_format.lstrip(\".\")` but allows path traversal sequences like `/../../` to pass through unchanged. When the filename is constructed via string concatenation in \n\n    f\"{timestamp}_{clean_title}.{file_format}\"\n\nmalicious path sequences are preserved, enabling attackers to write files outside the designated report directory. \n\nAn attacker can manipulate the LLM to call the tool with a specific `file_format` to overwrite critical system files like `__init__.py`, potentially leading to remote code execution.\n\n\n### Patches\n- Affected versions:\n\u003c=0.2.1\n- Patched versions:\n0.2.2 (includes fix from PR #12: https://github.com/zhongyu09/openchatbi/pull/12)\n\n### Workarounds\nNo\n\n### References\n- Issue #10: https://github.com/zhongyu09/openchatbi/issues/10\n- PR #12: https://github.com/zhongyu09/openchatbi/pull/12",
  "id": "PYSEC-2026-2794",
  "modified": "2026-07-13T16:05:19.342523Z",
  "published": "2026-07-13T14:36:40.268691Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zhongyu09/openchatbi/security/advisories/GHSA-vmwq-8g8c-jm79"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28795"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zhongyu09/openchatbi/issues/10"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zhongyu09/openchatbi/pull/12"
    },
    {
      "type": "WEB",
      "url": "https://github.com/zhongyu09/openchatbi/commit/372a7e861da5159c3106d64d6f6edf8284db8c75"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zhongyu09/openchatbi"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/openchatbi"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-vmwq-8g8c-jm79"
    }
  ],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenChatBI has a Path Traversal Vulnerability in save_report Tool"
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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