vulnerability
Ubuntu: (CVE-2026-31958): python-tornado vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:N/I:N/A:C) | Mar 11, 2026 | Apr 23, 2026 | Apr 23, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
Mar 11, 2026
Added
Apr 23, 2026
Modified
Apr 23, 2026
Description
Tornado is a Python web framework and asynchronous networking library. 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. This vulnerability is fixed in 6.5.5.
Solutions
ubuntu-pro-upgrade-python-tornadoubuntu-upgrade-python-tornado
References
- CVE-2026-31958
- https://attackerkb.com/topics/CVE-2026-31958
- CWE-400
- EUVD-EUVD-2026-11323
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-11323
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc
- https://ubuntu.com/security/notices/USN-8198-1
- https://www.cve.org/CVERecord?id=CVE-2026-31958
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.