High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 15, 2026

CVE-2026-91990

Description

Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.

Affected products

Tornadoweb/Tornadollm-fuzzy
Range: <6.5.8

Patches

Vulnerability mechanics

References

github.com/tornadoweb/tornado/security/advisories/GHSA-8423-8fgw-73vqnvd
www.vulncheck.com/advisories/tornado-before-6.5.8-memory-amplification-dos-via-multipartnvd

News mentions

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cvss	0.488
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patch	-0.070
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