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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 17 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-524
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title Tornado before 6.5.7 Credential Leak via Handle Reuse
First Time appeared Tornadoweb
Tornadoweb tornado
Weaknesses CWE-200
CPEs cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:*
Vendors & Products Tornadoweb
Tornadoweb tornado
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.2, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-17T15:16:30.401Z

Reserved: 2026-09-15T11:11:13.311Z

Link: CVE-2026-91992

cve-icon Vulnrichment

Updated: 2026-09-17T15:16:23.639Z

cve-icon NVD

Status : Deferred

Published: 2026-09-15T16:17:58.447

Modified: 2026-09-17T16:18:32.510

Link: CVE-2026-91992

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-15T15:18:33Z

Links: CVE-2026-91992 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-17T13:30:10Z

Weaknesses