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CVE-2026-91990
Linux Debian vulnerability analysis and mitigation

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.

Linux Distribution fix status

Fix availability across major Linux distributions and their releases.

Debian

Affected

bookworm

python-tornado

Affected

sid

python-tornado

Affected

trixie

python-tornado

Affected

SourceNVD

Related Linux Debian vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-91990HIGH8.7
  • Linux Debian logoLinux Debian
  • python3-tornado
NoNoSep 15, 2026
CVE-2026-91992HIGH8.2
  • Linux Debian logoLinux Debian
  • python-tornado
NoNoSep 15, 2026
CVE-2026-91991MEDIUM6.3
  • Linux Debian logoLinux Debian
  • python-tornado
NoNoSep 15, 2026
CVE-2026-91986MEDIUM5.3
  • Linux Debian logoLinux Debian
  • rust-toolset:rhel8::rust-analyzer
NoNoSep 15, 2026
CVE-2026-48785MEDIUM4.8
  • Linux Debian logoLinux Debian
  • apptainer-sle15_7
NoYesSep 15, 2026

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