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CVE-2026-91992

Tornado before 6.5.7 Credential Leak via Handle Reuse

CVSS 4.0 8.2 HIGHCVSS 3.1 5.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-91992

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-91992

Published

tornado

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "tornadoweb",
                    "product": "tornado",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/tornado",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "6.5.7"
                        },
                        {
                            "version": "6.5.7",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON