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Tornado CVE-2026-91992

| EUVDEUVD-2026-78664 HIGH
Information Exposure (CWE-200)
2026-09-15 VulnCheck GHSA-jqv5-7x9v-7j83
Information Disclosure Red Hat Suse Tornado Tornadoweb
8.2
CVSS 4.0 · Vendor: VulnCheck
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Vulnerability Assessment

Weakness
CWE
CWE-200
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Data exposure prevention
MITRE ATT&CK

2 techniques across 2 tactics: Collection, Discovery

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

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

Credential leakage in Tornado's CurlAsyncHTTPClient (all releases through 6.5.6) lets sensitive per-request state — client TLS certificates (SSLCERT/SSLKEY) and proxy basic-auth credentials (PROXYUSERPWD) — persist on pooled pycurl handles and be presented to a different, unintended host on a later request. The flaw affects applications that pass per-request credentials to the curl-backed client and reuse the same client instance across hosts; it is not reachable by an anonymous internet attacker against a default server deployment, and the vendor rates attack complexity as high with attack requirements present. No public exploit code has been identified at time of analysis and no active exploitation is reported; the vendor has fixed the issue in Tornado 6.5.7.

Affected VersionsENISA

Tornado 0 <6.5.7

Affected Packages

pypi tornado fix: 6.5.7

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (VulnCheck) PRIMARY 8.2 HIGH
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE 7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Red Hat 5.9 MEDIUM

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
None
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch available
Sep 15, 2026 - 16:03 EUVD
CVE Published
Sep 15, 2026 - 15:18 cve.org
HIGH 8.2

DescriptionCVE.org

Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.

Technical POC Analysis

Credential leak by resource reuse after release: CWE-200 (exposure of sensitive information), with the advisory also proposing CWE-672 (operation on a resource after release).

Full technical POC analysis - root cause, step-by-step exploitation and patch breakdown - is part of the Pro and Business plans.

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Threat Intelligence Overview

EPSS Score
0.2%
Top 89% exploitable
Data Quality
5 sources
Confidence: Medium
EUVD NVD CVE.org EPSS Vendor GitHub

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 No
EPSS 0.2%
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
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

41
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +41
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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Same weakness CWE-200 – Information Exposure

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected

References

Advisories & patches
ADVISORY https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-91992 ADVISORY https://ubuntu.com/security/notices/USN-8952-1 REF https://www.vulncheck.com/advisories/tornado-before-6.5.7-credential-leak-via-handle-reuse

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