CVE-2026-91992

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 Vector

References

• 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