CVE-2026-111181 body-parser vulnerable to Denial of Service via trailing bytes after a compressed request body
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-111181?
CVE-2026-111181 is a high-severity vulnerability in body-parser, published on 22 Oct 2026.
Official 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.
Weakness: CWE-248
Which versions are affected by CVE-2026-111181?
4 open source packages ship an affected version, including body-parser.
| Package | Affected | Fixed in |
|---|---|---|
body-parser npm | All versions | 1.20.9 |
body-parser npm | All versions | 1.20.9 |
body-parser npm | From 2.0.0 | 2.4.0 |
body-parser npm | From 2.0.0 | 2.4.0 |
How do I fix CVE-2026-111181?
Upgrade body-parser to a fixed version for your release line: 1.20.9 or 2.4.0.
Is CVE-2026-111181 being exploited?
There is no known exploitation of CVE-2026-111181 in the wild and no public exploit code.
Sources
Also known as AZL-110999, AZL-111059, CLSA-2026-1793097203, CLSA-2026-1793098476, CLSA-2026-1793098695, CLSA-2026-1793098724 and 20 more.