id: PYSEC-2026-2404
published: "2026-07-13T15:02:46.652262Z"
modified: "2026-07-13T15:02:46.652262Z"
aliases:
- CVE-2026-40162
- GHSA-8hw4-fhww-273g
summary: Bugsink affected by authenticated arbitrary file write in artifactbundle/assemble
details: "# Authenticated arbitrary file write in artifact bundle assembly\n\n## Summary\n\nAn authenticated file write vulnerability was identified in Bugsink **2.1.0** in the artifact bundle assembly flow.\n\nA user with a valid authentication token could cause the application to write attacker-controlled content to a filesystem location writable by the Bugsink process.\n\nThis issue requires authentication and affects only version **2.1.0**.\n\nThe issue is fixed in **2.1.1**.\n\n## Impact\n\nThis vulnerability allows an authenticated user to create or overwrite files **within locations writable by the Bugsink service account**.\n\nThe practical impact depends on the deployment environment and filesystem permissions of the running process.\n\nPossible consequences include:\n\n* modification of application data files\n* corruption of uploaded assets or temporary files\n* overwriting files in mounted writable volumes\n* disruption of normal application behavior\n\nNo unauthenticated exploitation is known.\n\nNo direct code execution has been demonstrated as part of this issue, though impact may be greater in deployments where the process has broad write permissions.\n\n## Affected versions\n\n* **Affected:** 2.1.0\n* **Fixed:** 2.1.1\n* **Not affected:** earlier releases\n\n## Mitigation\n\nUpgrade to **2.1.1**.\n\nAs a defense-in-depth measure, deployments should continue to ensure the Bugsink process runs with the **minimum required filesystem permissions**."
affected:
- package:
    name: bugsink
    ecosystem: PyPI
    purl: pkg:pypi/bugsink
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: 2.1.0
    - fixed: 2.1.1
  versions:
  - 2.1.0
references:
- type: WEB
  url: https://github.com/bugsink/bugsink/security/advisories/GHSA-8hw4-fhww-273g
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-40162
- type: PACKAGE
  url: https://github.com/bugsink/bugsink
- type: WEB
  url: https://github.com/bugsink/bugsink/releases/tag/2.1.1
- type: PACKAGE
  url: https://pypi.org/project/bugsink
- type: ADVISORY
  url: https://github.com/advisories/GHSA-8hw4-fhww-273g
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L