What is CVE-2026-31958?

CVE-2026-31958 is a high-severity vulnerability in Tornadoweb Tornado, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-03-11.

How severe is CVE-2026-31958?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Tornadoweb Tornado

CVE-2026-31958

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 s…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.004 (29.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Tornadoweb Tornado — versions < 6.5.5

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-31958?: CVE-2026-31958 is a high-severity vulnerability in Tornadoweb Tornado, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-03-11.
How severe is CVE-2026-31958?: High severity. CVSS v3 base score is 7.5 out of 10.