Bug 2571849 (CVE-2026-123874)

Summary: CVE-2026-123874 nodejs: nodejs: Denial of Service via HTTP/2 use-after-free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Node.js. A use-after-free memory flaw in the HTTP/2 implementation allows an unauthenticated remote attacker to corrupt server memory and cause a Denial of Service (DoS). By sending requests while the server is serving files, an attacker can cause the server to release an active stream object while a write operation is still queued. When the pending write completes, referencing the freed object leads to server memory corruption and terminates the process.
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Description OSIDB Bzimport 2026-11-11 18:41:19 UTC 
A use-after-free in Node.js HTTP/2 lets an unauthenticated client corrupt server memory, over both TLS and cleartext, when the server serves files with respondWithFile() or respondWithFD(). A client can make the server free an Http2Stream while a write request that points to it is still queued on the socket; when that write completes, the code dereferences and makes a virtual call through the freed object. The only precondition is that the application serves a file with stream.respondWithFile() or stream.respondWithFD(), with default settings otherwise. This vulnerability affects Node.js 26.x (since 26.9.0) and 24.x (since 24.22.0).