CVE-2026-91992CWE-200information-disclosure

CVE-2026-91992

Medium · published September 15, 2026

CVSS v3.1
5.9
EPSS
0%
Percentile
17.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
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
EPSS
0.00262 · 17.0th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-09-15T20:17Z
References (3)
https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f · [email protected]https://www.vulncheck.com/advisories/tornado-before-6.5.7-credential-leak-via-handle-reuse · [email protected]https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw6j-qg29-8w7f · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    Tornado before 6.5.7 Credential Leak via Handle Reuse
    cvelistv5