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Tornado CVE-2026-82397

| EUVDEUVD-2026-68892 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-08-31 GitHub_M GHSA-mpf4-983q-p7j4
Denial Of Service Python Suse Tornado Tornadoweb
7.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-accessible with no privileges or interaction needed; impact is availability-only as event loop stalls but no data is exposed or modified.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch available
Aug 31, 2026 - 23:02 EUVD
Source Code Evidence Fetched
Aug 31, 2026 - 22:07 vuln.today
Analysis Generated
Aug 31, 2026 - 22:07 vuln.today
CVE Published
Aug 31, 2026 - 21:28 cve.org
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 14,476 pypi packages depend on tornado (1,244 direct, 13,370 indirect)

Ecosystem-wide dependent count for version 6.5.8.

DescriptionCVE.org

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.

AnalysisAI

Denial-of-service in Tornado prior to 6.5.8 allows unauthenticated remote attackers to stall the entire server by sending a single POST request with millions of separator-delimited fields in an application/x-www-form-urlencoded body. Because Tornado's RequestHandler parses the body synchronously before handler dispatch using urllib.parse.parse_qs without a max_num_fields limit, a request body up to the 100 MB default max_buffer_size can consume all CPU on the single-threaded event loop and delay every concurrent connection. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation No special conditions are required beyond the ability to send an HTTP POST request to a Tornado application. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H scores 7.5 (High) and accurately reflects the threat model: any network-reachable Tornado endpoint accepting POST bodies can be targeted by an unauthenticated attacker with no complexity barrier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to Tornado 6.5.8, released August 6, 2026, which enforces a default limit of 1000 urlencoded form arguments per request and caps multipart parsing earlier in the pipeline. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all systems running Tornado and confirm versions below 6.5.8 in production; assess which endpoints are internet-exposed. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-82397 vulnerability details – vuln.today
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