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Vulnerability record · CVE-2026-91992 · published 15 September 2026

CVE-2026-91992: Information exposure vulnerability

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.

8.2 CVSS 4.0 High EPSS 0.26% · top 83.9% CWE-200 · Information exposure Deferred
8.2CVSS 4.0 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-91992), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.