Bug 2542963

Summary: CVE-2026-91095 proxygen: proxygen: Denial of Service via use-after-free in WebTransport stream handling [fedora-all]
Product: [Fedora] Fedora Reporter: TEJ RATHI <trathi>
Component: proxygenAssignee: Michel Lind <michel>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: michel
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["0d418b0b-498f-4d83-ab0b-bc2362300158"]}
Fixed In Version: Doc Type: ---
Doc Text:
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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: 2542693    

Description TEJ RATHI 2026-09-29 06:26:20 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.

In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.