CVE Explorer
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 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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"tornado","vendor":"tornadoweb","versions":[{"status":"affected","version":"< 6.5.5"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:fd078776cb0b9fc437e854c97c1685d8456c94b51335afcbf3730abe68748632 · sha256:2db8a484dbb52c0b… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:fd078776cb0b9fc437e854c97c1685d8456c94b51335afcbf3730abe68748632 · sha256:2db8a484dbb52c0b… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:fd078776cb0b9fc437e854c97c1685d8456c94b51335afcbf3730abe68748632 · sha256:2db8a484dbb52c0b… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:fd078776cb0b9fc437e854c97c1685d8456c94b51335afcbf3730abe68748632 · sha256:2db8a484dbb52c0b… · /containers/cna/references/0
{"url":"https://lists.debian.org/debian-lts-announce/2026/04/msg00000.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:fd078776cb0b9fc437e854c97c1685d8456c94b51335afcbf3730abe68748632 · sha256:2db8a484dbb52c0b… · /containers/adp/1/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.