id: PYSEC-2026-1713
published: "2026-07-07T16:02:54.373804Z"
modified: "2026-07-07T17:24:53.102736Z"
aliases:
- CVE-2025-48879
- GHSA-9wj4-8h85-pgrw
summary: OctoPrint Vulnerable to Denial of Service through malformed HTTP request in OctoPrint
details: "### Impact\n\nOctoPrint versions up until and including 1.11.1 contain a vulnerability that allows any unauthenticated attacker to send a manipulated broken `multipart/form-data` request to OctoPrint and through that make the web server component become unresponsive. This could be used to effectively run a denial of service attack on the OctoPrint server.\n\n### Patches\n\nThe vulnerability has been patched in version 1.11.2.\n\n### Workaround\n\nOctoPrint administrators are once more reminded to not make OctoPrint available on hostile networks (e.g. the internet), regardless of whether this vulnerability is patched or not.\n\n### Details\n\nThe issue can be triggered by a broken `multipart/form-data` request lacking an end boundary to any of OctoPrint's endpoints implemented through the `octoprint.server.util.tornado.UploadStorageFallbackHandler` request handler. The request handler will get stuck in an endless busy loop, looking for a part of the request that will never come. As Tornado is single-threaded, that will effectively block the whole web server.\n\nThe fix adds detection of invalid requests like that and ensures they are handled gracefully with an HTTP 400 Bad Request response.\n\n### Credits\n\nThis vulnerability was discovered and responsibly disclosed to OctoPrint by Jacopo Tediosi."
affected:
- package:
    name: octoprint
    ecosystem: PyPI
    purl: pkg:pypi/octoprint
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 1.11.2
  versions:
  - 1.10.0
  - 1.10.0rc1
  - 1.10.0rc2
  - 1.10.0rc3
  - 1.10.0rc4
  - 1.10.1
  - 1.10.2
  - 1.10.3
  - 1.11.0
  - 1.11.0rc1
  - 1.11.0rc2
  - 1.11.0rc3
  - 1.11.0rc4
  - 1.11.0rc5
  - 1.11.0rc6
  - 1.11.0rc7
  - 1.11.1
  - 1.3.11
  - 1.3.12
  - 1.3.12rc1
  - 1.3.12rc3
  - 1.4.0
  - 1.4.0rc1
  - 1.4.0rc2
  - 1.4.0rc3
  - 1.4.0rc4
  - 1.4.0rc5
  - 1.4.0rc6
  - 1.4.1
  - 1.4.1rc1
  - 1.4.1rc2
  - 1.4.1rc3
  - 1.4.1rc4
  - 1.4.2
  - 1.5.0
  - 1.5.0rc1
  - 1.5.0rc2
  - 1.5.0rc3
  - 1.5.1
  - 1.5.2
  - 1.5.3
  - 1.6.0
  - 1.6.0rc1
  - 1.6.0rc2
  - 1.6.0rc3
  - 1.6.1
  - 1.7.0
  - 1.7.0rc1
  - 1.7.0rc2
  - 1.7.0rc3
  - 1.7.1
  - 1.7.2
  - 1.7.3
  - 1.8.0
  - 1.8.0rc1
  - 1.8.0rc2
  - 1.8.0rc3
  - 1.8.0rc4
  - 1.8.0rc5
  - 1.8.1
  - 1.8.2
  - 1.8.3
  - 1.8.4
  - 1.8.5
  - 1.8.6
  - 1.8.7
  - 1.9.0
  - 1.9.0rc1
  - 1.9.0rc2
  - 1.9.0rc3
  - 1.9.0rc4
  - 1.9.0rc5
  - 1.9.0rc6
  - 1.9.1
  - 1.9.2
  - 1.9.3
references:
- type: WEB
  url: https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-9wj4-8h85-pgrw
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2025-48879
- type: WEB
  url: https://github.com/OctoPrint/OctoPrint/commit/c9c35c17bd820f19c6b12e6c0359fc0cfdd0c1ec
- type: PACKAGE
  url: https://github.com/OctoPrint/OctoPrint
- type: PACKAGE
  url: https://pypi.org/project/octoprint
- type: ADVISORY
  url: https://github.com/advisories/GHSA-9wj4-8h85-pgrw
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H