CVE-2026-91992

MEDIUM 5.9

Tornado before 6.5.7 Credential Leak via Handle Reuse

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	tornadoweb
Product	tornado
Published	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

tornadoweb / tornado

0 < 6.5.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f vulncheck.com: https://www.vulncheck.com/advisories/tornado-before-6.5.7-credential-leak-via-handle-reuse