# CVE-2026-91992

## Summary

- **CVE ID:** CVE-2026-91992
- **Severity:** HIGH
- **CVSS Score:** 8.2 (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)
- **CWE:** CWE-200
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 17, 2026

## 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.

## Affected Products

- tornadoweb — tornado (0)
- tornadoweb — tornado (6.5.7)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 10.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._