CVE-2025-13466: Body parser Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-wqch-xfxh-vrr4
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CVSS 5.3
CWE-400
Published
Advisory Summary

CVE-2025-13466 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Body parser libraries in the npm ecosystem. The issue involves body-parser is vulnerable to denial of service when url encoding is used. Remediation is available by upgrading affected packages to version 2.2.1.

CVE-2025-13466 at a Glance

CVE Identifier CVE-2025-13466
GHSA Identifier GHSA-wqch-xfxh-vrr4
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Body parser
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-13466

To remediate this vulnerability, upgrade all affected Body parser dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

body-parser fixed: 2.2.1 
npm install body-parser@2.2.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls body-parser

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-13466, inspect your project dependencies using npm:

npm ls body-parser

Analyze the terminal output to locate any version of Body parser in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.1), your application is affected.

Note: The npm ls body-parser command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Body parser, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact body-parser 2.2.0 is vulnerable to denial of service due to inefficient handling of URL-encoded bodies with very large numbers of parameters. An attacker can send payloads containing thousands of parameters within the default 100KB request size limit, causing elevated CPU and memory usage. This can lead to service slowdown or partial outages under sustained malicious traffic. ### Patches This issue is addressed in version 2.2.1.

CVE-2025-13466 Affected Body parser Versions

1 component(s)
Fixed Versions:
2.2.1
Product / Package Ecosystem Affected Versions Fixed Version
body-parser
npm/body-parser
npm
≥ 2.2.0
< 2.2.1
2.2.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/expressjs/body-parser/security/advisories/GHSA-wqch-xfxh-vrr4
NVD — CVE-2025-13466 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-13466
Security Fix Commit FIX COMMIT
https://github.com/expressjs/body-parser/commit/b204886a6744b0b6d297cd0e849d75de836f3b63
Body parser Source Repository REPOSITORY
https://github.com/expressjs/body-parser
Body parser Release RELEASE
https://github.com/expressjs/body-parser/releases/tag/v2.2.1

Frequently Asked Questions

What is CVE-2025-13466?
CVE-2025-13466 is a security vulnerability in Body parser involving body-parser is vulnerable to denial of service when url encoding is used under CWE-400: Uncontrolled Resource Consumption.
Which Body parser versions are affected?
Affected versions include releases prior to 2.2.1 across affected packages: body-parser.
What version fixes CVE-2025-13466?
Upgrading to 2.2.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is body-parser affected?
Yes, body-parser is affected in releases prior to 2.2.1. Upgrade your dependency to 2.2.1 or later.
What is the CVSS score of CVE-2025-13466?
CVE-2025-13466 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-13466?
CVE-2025-13466 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2025-13466?
Run the dependency tree command: 'npm ls body-parser'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wqch-xfxh-vrr4",
  "modified" : "2025-11-25T18:09:52Z",
  "published" : "2025-11-25T14:20:21Z",
  "aliases" : [ "CVE-2025-13466" ],
  "summary" : "body-parser is vulnerable to denial of service when url encoding is used",
  "details" : "### Impact\n\nbody-parser 2.2.0 is vulnerable to denial of service due to inefficient handling of URL-encoded bodies with very large numbers of parameters. An attacker can send payloads containing thousands of parameters within the default 100KB request size limit, causing elevated CPU and memory usage. This can lead to service slowdown or partial outages under sustained malicious traffic.\n\n### Patches\n\nThis issue is addressed in version 2.2.1.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "body-parser"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.2.0"
      }, {
        "fixed" : "2.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/expressjs/body-parser/security/advisories/GHSA-wqch-xfxh-vrr4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-13466"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/expressjs/body-parser/commit/b204886a6744b0b6d297cd0e849d75de836f3b63"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/expressjs/body-parser"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/expressjs/body-parser/releases/tag/v2.2.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-11-25T14:20:21Z",
    "nvd_published_at" : "2025-11-24T19:15:46Z"
  }
}