GHSA-7cx3-6m66-7c5m

Suggest an improvement
Source
https://github.com/advisories/GHSA-7cx3-6m66-7c5m
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/05/GHSA-7cx3-6m66-7c5m/GHSA-7cx3-6m66-7c5m.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-7cx3-6m66-7c5m
Aliases
Published
2025-05-16T14:12:40Z
Modified
2025-05-16T14:49:41.050758Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Tornado vulnerable to excessive logging caused by malformed multipart form data
Details

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 6.5.0 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.

Database specific 
{
    "nvd_published_at": "2025-05-15T22:15:18Z",
    "cwe_ids": [
        "CWE-770"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2025-05-16T14:12:40Z"
}
References

Affected packages

PyPI / tornado

Package

Name
tornado
View open source insights on deps.dev
Purl
pkg:pypi/tornado

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.5.0

Affected versions

0.*

0.2

1.*

1.0
1.1
1.1.1
1.2
1.2.1

2.*

2.0
2.1
2.1.1
2.2
2.2.1
2.3
2.4
2.4.1

3.*

3.0
3.0.1
3.0.2
3.1
3.1.1
3.2
3.2.1
3.2.2

4.*

4.0
4.0.1
4.0.2
4.1b2
4.1
4.2b1
4.2
4.2.1
4.3b1
4.3b2
4.3
4.4b1
4.4
4.4.1
4.4.2
4.4.3
4.5b1
4.5b2
4.5
4.5.1
4.5.2
4.5.3

5.*

5.0a1
5.0b1
5.0
5.0.1
5.0.2
5.1b1
5.1
5.1.1

6.*

6.0a1
6.0b1
6.0
6.0.1
6.0.2
6.0.3
6.0.4
6.1b1
6.1b2
6.1
6.2b1
6.2b2
6.2
6.3b1
6.3
6.3.1
6.3.2
6.3.3
6.4b1
6.4
6.4.1
6.4.2
6.5b1