Bug 2571843 (CVE-2026-65833)

Summary: CVE-2026-65833 @iopress/core: @iopress/core: Denial of service via malformed chunked transfer encoding requests
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: 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 @iopress/core. The HTTP request parser improperly handles chunked transfer encoding when a request declares a chunk size larger than the payload actually received. A remote attacker can exploit this vulnerability by sending a specially crafted request, causing the application to read past the boundary of the allocated memory buffer. This issue can lead to a Denial of Service (DoS) by crashing the application or potentially result in unauthorized information disclosure from system memory.
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Description OSIDB Bzimport 2026-11-11 18:32:02 UTC 
iopress is a native HTTP server for Node.js with platform-specific async I/O. Prior to version 1.0.5, the chunked-transfer-encoding HTTP request parser in @iopress/core reads past the end of the input buffer when a request declares a chunk size larger than the body actually received. This results in a heap-buffer-over-read. This issue has been patched in version 1.0.5.