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CVE-2026-91992 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f	CISA-ADP	AdvisoryVendor
https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f	[email protected]	AdvisoryVendor
https://www.vulncheck.com/advisories/tornado-before-6.5.7-credential-leak-via-handle-reuse	[email protected]	AdvisoryVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

Product	Versions
Tornado	<= 6.5.6 (semver)
CPE cpe:2.3:a:tornadoweb:tornado:::::::: Remediation Upgrade: 6.5.7moderate effort Workaround:low effort Use a separate CurlAsyncHTTPClient instance for each distinct credential set (per client certificate and per proxy credential). Alternatively, use SimpleAsyncHTTPClient where applicable.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 17, 2026	CVE Modified	CISA-ADP
Sep 15, 2026	New CVE Received	[email protected]