Bug 2571848 (CVE-2026-123875)

Summary: CVE-2026-123875 nodejs: nodejs: Denial of Service via cancelled HTTP/2 file downloads
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: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Node.js. An unauthenticated remote attacker can cause a Denial of Service (DoS) by terminating the server process during file transfers. When a client cancels an active file download over an HTTP/2 connection, internal streaming resources are released out of sequence, resulting in an invalid memory access that crashes the application.
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Description OSIDB Bzimport 2026-11-11 18:41:15 UTC 
A NULL pointer dereference in Node.js HTTP/2 lets an unauthenticated client crash the server, over both TLS and cleartext, by cancelling file downloads. When the server serves a file with stream.respondWithFile() or stream.respondWithFD() and the client cancels the request, a StreamPipe used for the transfer is torn down in an order that leaves a NULL pointer which is then dereferenced, aborting the process. No crafted frames are needed, and a handful of cancelled requests against a default file-serving handler is enough. This vulnerability affects Node.js 26.x, 24.x, and 22.x.