Bug 2542692 (CVE-2026-84895)

Summary: CVE-2026-84895 proxygen: proxygen: Denial of Service via use-after-free during session closure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in proxygen. During session closure, member data continues to be accessed after calling the base termination method, which may notify the session handler and destroy the session object. A remote attacker can exploit this use-after-free condition to cause a Denial of Service (DoS) through an application crash or potentially trigger memory corruption.
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Bug Depends On: 2542962    
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Description OSIDB Bzimport 2026-09-28 20:51:34 UTC 
In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it.