Bug 2559049 (CVE-2026-111181)

Summary: CVE-2026-111181 body-parser: body-parser: Denial of Service via unhandled decompression stream error
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in body-parser. A remote, unauthenticated attacker can cause a Denial of Service (DoS) by sending a specially crafted HTTP request with compressed content containing unexpected trailing data. Because the application fails to handle decompression stream errors after processing the initial compressed content, the trailing data triggers an uncaught exception that terminates the server process.
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Description OSIDB Bzimport 2026-10-22 14:42:15 UTC 
body-parser is body parsing middleware for Node.js and Express. In versions before 1.20.9 and in versions from 2.0.0 before 2.4.0, a single request can crash any application using body-parser with default options. When a request carries a Content-Encoding such as gzip, body-parser pipes it into a decompression stream and, after reading the body, leaves that stream with no error listener. A payload of one valid compressed frame followed by trailing bytes decodes and the application responds normally, but the trailing bytes then reach the already-finished decoder, which emits an error that is re-thrown as an uncaught exception and terminates the process. No matching route is required because body parsing runs before routing, so any endpoint that parses a body is affected. The issue is fixed in body-parser 2.4.0 and 1.20.9, and users should upgrade to one of those versions or later. As a workaround, disable request-body inflation (set the body-parser inflate option to false) so encoded requests are rejected before any decompression stream is created.