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Vulnerabilities

Vulnerability · CVE-2026-91992

Tornado before 6.5.7 Credential Leak via Handle Reuse

Published Sep 15, 2026 · catalog updated Sep 17, 2026 · Tornado before 6.5.7 Credential

Check if you run it

No confirmed exploitation is on record for CVE-2026-91992. EPSS is 0.26%. Act only if a listed version of Tornado before 6.5.7 Credential is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Tornado before 6.5.7 Credential).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.26%
Remediation
Advisory link
Affected products
vendor tornadoweb tornado

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor tornadoweb tornadoversion unspecified

How to fix CVE-2026-91992

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-91992. EPSS is 0.26%. Act only if a listed version of Tornado before 6.5.7 Credential is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 17, 2026 · CVE.org

    Updated

    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.

  2. Oct 22, 2026 · Ubuntu Security Notices

    Detected

    CVE-2026-91992 is listed by USN-8952-1: Tornado vulnerabilities.

Sources

  • CVE.orgVulnerability recordCVE-2026-91992

    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 certif

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-91992

    30-day exploitation probability 0.26%

    first.org
  • Ubuntu Security NoticesVendor advisoryCVE-2026-91992

    It was discovered that Tornado did not properly handle certain HTTP requests and network inputs. An attacker could possibly use these issues to cause a denial of service, expose sensitive information, or bypass access controls. (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE

    ubuntu.com

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.