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| purl | pkg:pypi/tornado@6.5 |
| Vulnerability | Summary | Fixed by |
|---|---|---|
|
VCID-be89-uuxa-fyb5
Aliases: CVE-2026-31958 GHSA-qjxf-f2mg-c6mc |
Tornado is vulnerable to DoS due to too many multipart parts 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 by 0 other vulnerabilities. |
|
VCID-jbwv-ayru-8fgm
Aliases: GHSA-78cv-mqj4-43f7 |
Tornado has incomplete validation of cookie attributes Values passed to the `domain`, `path`, and `samesite` arguments of `RequestHandler.set_cookie` were not completely validated in versions of Tornado prior to 6.5.5. In particular, semicolons would be allowed, which could be used to inject attacker-controlled values for other cookie attributes. |
Affected by 0 other vulnerabilities. |
| Vulnerability | Summary | Aliases |
|---|---|---|
| VCID-62bx-a5uf-j3b4 | Tornado vulnerable to excessive logging caused by malformed multipart form data ### Summary When Tornado's ``multipart/form-data`` parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. ### Affected versions All versions of Tornado prior to 6.5 are affected. The vulnerable parser is enabled by default. ### Solution Upgrade to Tornado version 6.5. In the meantime, risk can be mitigated by blocking `Content-Type: multipart/form-data` in a proxy. |
CVE-2025-47287
GHSA-7cx3-6m66-7c5m |