CVE-2026-91990
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- 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
- EPSS probability
- 0.41%
- CWE
- CWE-770
- Published
- 2026-09-15
- Last modified
- 2026-09-15
Affected products
- tornadoweb tornado
- tornadoweb tornado
Weakness type
Related vulnerabilities
- CVE-2026-1168 — Allocation of Resources Without Limits or Throttling in GitLab
- CVE-2025-14871 — Allocation of Resources Without Limits or Throttling in GitLab
- CVE-2026-88878 — Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass
- CVE-2026-82439 — Apache Storm DRPC: Unauthenticated Unbounded Memory Growth in DRPC
- CVE-2026-72684 — Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
- CVE-2026-74878 — openssl_encrypt before 1.4.0 TOTP Rate Limiter Bypass
- CVE-2026-77337 — CakePHP: Potential Authentication bypass with CookieAuthenticator
- CVE-2026-79921 — amqp091-go has a Potential Memory Exhaustion/Protocol Violation via Broker-Controlled Oversized Payload