SB2026091515 - Operation on a Resource after Expiration or Release in Tornado

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Main Vulnerability Database SB2026091515

SB2026091515 - Operation on a Resource after Expiration or Release in Tornado

Published: September 15, 2026

Security Bulletin ID SB2026091515
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Operation on a Resource after Expiration or Release (CVE-ID: N/A)

CWE-ID: CWE-672 - Operation on a Resource after Expiration or Release

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to failure to clear sensitive state in CurlAsyncHTTPClient when reusing pycurl handles for requests with differing per-request options. A remote attacker can cause a subsequent request to be directed to an attacker-controlled host or proxy to disclose sensitive information.

Exploitation depends on a shared client reusing a handle after requests use different client certificate or proxy credential settings.


Remediation

Install update from vendor's website.

References