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High

Tornado is vulnerable to DoS due to too many multipart parts

  • Disclosed: 11.03.2026
  • Updated: 11.10.2026 15:17

In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts.

Tornado 6.5.5 introduces new limits on the size and complexity of multipart bodies, including a default limit of 100 parts per request. These limits are configurable if needed; see tornado.httputil.ParseMultipartConfig. It is also now possible to disable multipart/form-data parsing entirely if it is not required for the application.

Affected software

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PlatformPackageVulnerable versionsFixed in
Python (PyPI) tornado < 6.5.5 6.5.5

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-400
Platform
Python (PyPI)
Package
tornado
Disclosed
11.03.2026
Updated
11.10.2026 15:17

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-140 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-qjxf-f2mg-c6mc - CC BY 4.0

Vulnerability history: tornado

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (23) in the archive
Total entries
23
First → latest
05.2012 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 13
  • Medium 8
  • Low 2

Disclosures per year

earlier: 1

Severity:
  1. tornado: CurlAsyncHTTPClient enforces no response-size limit — decompression bomb drives unbounded memory accumulation to OOM
    High · 7.5 CVE-2026-103262 < 6.5.9 6.5.9
  2. Tornado: StaticFileHandler follows symlinks outside static root (path traversal)
    High CVE-2026-103263 < 6.5.9 6.5.9
  3. Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop
    High · 7.5 CVE-2026-82397 < 6.5.8 6.5.8
  4. Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient
    High · 7.7 CVE-2026-49853 < 6.5.6 6.5.6
  5. tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)
    High · 7.5 CVE-2026-49855 < 6.5.6 6.5.6
  6. Tornado has cookie attribute injection via .RequestHandler.set_cookie
    High · 7.2 CVE-2026-35536 < 6.5.5 6.5.5
  7. Tornado is vulnerable to DoS due to too many multipart parts this entry
    High · 7.5 CVE-2026-31958 < 6.5.5 6.5.5
  8. Tornado: Quadratic DoS via Crafted Multipart Parameters
    High · 7.5 CVE-2025-67726 < 6.5.3 6.5.3
  9. Tornado: Quadratic DoS via Repeated Header Coalescing
    High · 7.5 CVE-2025-67725 < 6.5.3 6.5.3
  10. Tornado vulnerable to excessive logging caused by malformed multipart form data
    High · 7.5 CVE-2025-47287 < 6.5 6.5
  11. Tornado has an HTTP cookie parsing DoS vulnerability
    High · 7.5 CVE-2024-52804 < 6.4.2 6.4.2
  12. Tornado before 3.2.2 sends arbitrary responses that contain a fixed CSRF token and may be sent with HTTP compression, which makes it easier for remote attackers to conduct a BREACH attack and determin
    High · 6.5 CVE-2014-9720 < 3.2.2 3.2.2
  13. CRLF injection vulnerability in the tornado.web.RequestHandler.set_header function in Tornado before 2.2.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting
    High · 7.5 CVE-2012-2374 < 2.2.1 2.2.1

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