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.

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Workaround

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History

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: 2026-09-15T15:18:33.089Z

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

Link: CVE-2026-91992

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-91992

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:45:18Z

Weaknesses