CVE-2026-91990

Tornado before 6.5.8 Memory Amplification DoS via multipart

En bref

Sévérité: HIGH 8.7
EPSS: EPSS 0.42 % · centile 36 (2026-10-27)
État: PUBLISHED
Publiée: 2026-09-15
Mise à jour: 2026-09-15
Attribuée par: VulnCheck
Statut NVD: Deferred

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.

Scores

Version	Score	Vecteur	Évalué par
CVSS 4.0	HIGH 8.7	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	VulnCheck
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck
CVSS 4.0	HIGH 8.7	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · disclosure@vulncheck.com (Secondary)

Faiblesses (CWE)

CWE-770

Avis

GHSA-8423-8fgw-73vq — tornado: multipart split() creates huge temp list before max_parts check -> memory amplification DoS (httputil.py:34)

Références européennes

ENISA EUVD · EUVD-2026-78661
GCVE · GCVE-0-2026-91990

Produits affectés

Produit	Versions
tornadoweb · tornado	affected 0 < 6.5.8 ; unaffected 6.5.8

Références

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD