# CVE-2026-111181: body-parser vulnerable to Denial of Service via trailing bytes after a compressed request body

CVE-2026-111181 is fixed in node-body-parser on 1 platform by DEBIAN-CVE-2026-111181 (version 2.4.0+~1.19.6-1), released October 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-111181
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0039
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 22, 2026
- Weakness: Uncaught Exception
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111181

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-body-parser Debian 14 | 2.4.0+~1.19.6-1 | [DEBIAN-CVE-2026-111181](https://patchblox.com/security/data/fix/linux/debian-cve-2026-111181.md) | Oct 27, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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