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py3-tornado EUVDEUVD-2025-203029

| CVE-2025-67726 HIGH
Uncontrolled Resource Consumption (CWE-400)
N/A vendor:alpine GHSA-jhmp-mqwm-3gq8 PYSEC-2025-267
7.5
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Unknown prerequisites
  2. Exploit
    Interact with Tornado application
  3. Execution
    Trigger unspecified vulnerability
  4. Impact
    Achieve unknown impact

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation conditions cannot be determined from available data. No CVSS vector is present to indicate attack vector (network vs. local), complexity, or privilege requirements. No description details configuration requirements, affected features, or deployment modes. Authentication requirements not confirmed from available data. The absence of a CVSS PR field means it is unknown whether exploitation requires authenticated access. Security teams cannot assess realistic exploitation prerequisites until a vendor advisory or CVE description with technical detail is published.

Impact

Risk assessment is severely constrained by data scarcity. No CVSS score or vector is available, meaning attack vector, complexity, privilege requirements, and scope are all unknown. The EPSS score of 0.04% at the 11th percentile indicates low probability of exploitation in the near term based on current signals, which is consistent with the absence of both KEV listing and public POC code. No public exploit identified at time of analysis. No SSVC decision data is available. Without CVSS, CWE, or a vendor advisory describing the vulnerability class or impact, it is not possible to assess whether this is a remote code execution, denial of service, information disclosure, or lesser-severity issue. Security teams should treat this as low-signal-but-unverified - the low EPSS argues against emergency response, but the absence of a severity rating does not confirm low severity.

Exploit ScenarioDerived

No exploit scenario can be constructed with confidence - the vulnerability type, affected component within Tornado, and required conditions are entirely undisclosed. No public exploit identified at time of analysis and no KEV listing exists. Any scenario description would be speculative invention rather than data-grounded analysis.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – May 27, 2026

py3-tornado in Alpine Linux received a security fix packaged as version 6.5.4-r0, addressing an unspecified vulnerability in the Tornado asynchronous Python web framework. The nature, severity, and impact of the underlying flaw are not disclosed in available intelligence - no CVE description, CVSS vector, or CWE classification has been published. With an EPSS score of 0.04% (11th percentile) and no public exploit identified at time of analysis, the current exploitation signal is very low, though the absence of severity data prevents meaningful risk contextualization.

RemediationAI

Upgrade the py3-tornado package on Alpine Linux to version 6.5.4-r0 or later using the standard Alpine package manager: 'apk upgrade py3-tornado'. This is the vendor-released patch per the Alpine Linux advisory. The exact upstream Tornado fix version corresponding to Alpine package 6.5.4-r0 should be cross-referenced against the upstream Tornado changelog at the project's official site to confirm the specific security fix included. No workarounds or compensating controls can be specified because the vulnerability class and attack surface are unknown. If immediate patching is not possible, consider restricting network access to services running Tornado-based applications as a general precaution, noting this may impact availability of legitimate traffic.

Affected VersionsENISA

Tornado < 6.5.3
Tornado < 6.5.3

Affected Packages

pypi tornado fix: 6.5.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Tornado is an asynchronous, non-blocking Python web framework and networking library commonly used for building web applications, APIs, and real-time services. The affected package is py3-tornado, the Alpine Linux packaging of the upstream Tornado library. The Alpine package version 6.5.4-r0 follows the Alpine naming convention of <upstream_version>-r<package_revision>, suggesting upstream Tornado version 6.5.4 contains the fix. No CWE classification is available, so the root cause vulnerability class - whether it is a memory safety issue, injection flaw, authentication bypass, or other category - cannot be determined from current data. No CPE strings were provided to further narrow the affected component.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionCVE.org

Alpine Linux: py3-tornado fixed in 6.5.4-r0

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 pypi packages depend on tornado (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 6.5.3.

Threat Intelligence Overview

EPSS Score
0.0%
Top 89% exploitable
Threat Intel
1
1 source
Exploit
POC
Public exploit code exists
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
Poc
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

CVE-2024-42733 CRITICAL POC
9.8 Mar 07

An issue in Docmosis Tornado v.2.9.7 and before allows a remote attacker to execute arbitrary code via a crafted script

CVE-2023-25266 HIGH POC
8.8 Feb 28

An issue was discovered in Docmosis Tornado prior to version 2.9.5. Rated high severity (CVSS 8.8), this vulnerability i

CVE-2023-25265 HIGH POC
7.5 Feb 28

Docmosis Tornado <= 2.9.4 is vulnerable to Directory Traversal leading to the disclosure of arbitrary content on the fil

CVE-2023-25264 HIGH POC
7.5 Feb 28

An issue was discovered in Docmosis Tornado prior to version 2.9.5. Rated high severity (CVSS 7.5), this vulnerability i

CVE-2026-103262 HIGH
8.7 Oct 01

Denial of service in the Tornado web framework's CurlAsyncHTTPClient (all releases before 6.5.9) lets an unauthenticated

CVE-2026-31958 HIGH
8.7 Mar 11

In versions of Tornado prior to 6.5.5, the only limit on the number of parts in `multipart/form-data` is the `max_body_s

CVE-2026-91990 HIGH
8.7 Sep 15

Memory amplification denial of service in the Tornado Python web framework before 6.5.8 lets unauthenticated remote atta

CVE-2026-91992 HIGH
8.2 Sep 15

Credential leakage in Tornado's CurlAsyncHTTPClient (all releases through 6.5.6) lets sensitive per-request state — clie

CVE-2026-103263 HIGH
8.2 Oct 01

Unauthenticated local file disclosure in Tornado before 6.5.9 lets remote attackers read files outside a configured stat

CVE-2026-82397 HIGH
7.5 Aug 31

Denial-of-service in Tornado prior to 6.5.8 allows unauthenticated remote attackers to stall the entire server by sendin

CVE-2025-67725 HIGH
7.5

Tornado Python web framework on Alpine Linux received a security fix in package version 6.5.4-r0, addressing an uncharac

CVE-2024-52804 HIGH
7.5 Nov 22

Tornado is a Python web framework and asynchronous networking library. Rated high severity (CVSS 7.5), this vulnerabilit

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