CVE-2026-91990Tornado before 6.5.8 Memory Amplification DoS via multipart
Updated under an hour ago ()
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It affects tornadoweb tornado. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
tornadoweb tornado tornadoweb:tornado (from the name) | before 6.5.8; 6.5.8 not affected | CNA record |
References
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-8423-8fgw-73vqvendor-advisory
- https://www.vulncheck.com/advisories/tornado-before-6.5.8-memory-amplification-dos-via-multipartthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.