Bug 2540204

Summary: CVE-2026-91992 python-flit: Tornado: Credential leak via HTTP client handle reuse [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Ganesh <gnaik>
Component: python-flitAssignee: Michel Lind <michel>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel9CC: epel-packagers-sig, maxwell, michel, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["160a587b-083a-449e-a600-edbcffa90dd8"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2487042, 2533894    

Description Ganesh 2026-09-24 15:26:51 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Michel Lind 2026-09-29 20:22:47 UTC 
Reassigning from `epel10` to `epel9`: Bug filed against a branch the package never shipped on.