CVE-2026-42034: Axios Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-5c9x-8gcm-mpgx
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CVSS 5.3
CWE-770
Published
Advisory Summary

CVE-2026-42034 is a MODERATE (CVSS 5.3) security vulnerability vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Axios libraries in the npm ecosystem. The issue involves 0. Remediation is available by upgrading affected packages to version 1.15.1, 0.31.1.

CVE-2026-42034 at a Glance

CVE Identifier CVE-2026-42034
GHSA Identifier GHSA-5c9x-8gcm-mpgx
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Axios
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-2026-42034

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

axios fixed: 1.15.1 
npm install axios@1.15.1
axios fixed: 0.31.1 
npm install axios@0.31.1
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 axios

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-42034, inspect your project dependencies using npm:

npm ls axios

Analyze the terminal output to locate any version of Axios in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.15.1), your application is affected.

Note: The npm ls axios 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Axios, 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

### Summary For stream request bodies, maxBodyLength is bypassed when maxRedirects is set to 0 (native http/https transport path). Oversized streamed uploads are sent fully even when the caller sets strict body limits. ### Details Relevant flow in lib/adapters/http.js: - 556-564: maxBodyLength check applies only to buffered/non-stream data. - 681-682: maxRedirects === 0 selects native http/https transport. - 694-699: options.maxBodyLength is set, but native transport does not enforce it. - 925-945: stream is piped directly to socket (data.pipe(req)) with no Axios byte counting. This creates a path-specific bypass for streamed uploads. ### PoC Environment: - Axios main at commit f7a4ee2 - Node v24.2.0 Steps: 1. Start an HTTP server that counts uploaded bytes and returns {received}. 2. Send a 2 MiB Readable stream with: - adapter: 'http' - maxBodyLength: 1024 - maxRedirects: 0 Observed: - Request succeeds; server reports received: 2097152. Control checks: - Same stream with default/nonzero redirects: rejected with ERR_FR_MAX_BODY_LENGTH_EXCEEDED. - Buffered body with maxRedirects: 0: rejected with ERR_BAD_REQUEST. ### Impact Type: DoS / uncontrolled upstream upload / resource exhaustion. Impacted: Node.js services using streamed request bodies with maxBodyLength expecting hard enforcement, especially when following Axios guidance to use maxRedirects: 0 for streams.

CVE-2026-42034 Affected Axios Versions

2 component(s)
Fixed Versions:
1.15.10.31.1
Product / Package Ecosystem Affected Versions Fixed Version
axios
npm/axios
npm
≥ 1.0.0
< 1.15.1
1.15.1
axios
npm/axios
npm
< 0.31.1
0.31.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/axios/axios/security/advisories/GHSA-5c9x-8gcm-mpgx
NVD — CVE-2026-42034 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42034
Axios Source Repository REPOSITORY
https://github.com/axios/axios

Frequently Asked Questions

What is CVE-2026-42034?
CVE-2026-42034 is a security vulnerability in Axios involving 0 under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Axios versions are affected?
Affected versions include releases prior to 1.15.1, 0.31.1 across affected packages: axios.
What version fixes CVE-2026-42034?
Upgrading to 1.15.1, 0.31.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is axios affected?
Yes, axios is affected in releases prior to 1.15.1, 0.31.1. Upgrade your dependency to 1.15.1, 0.31.1 or later.
What is the CVSS score of CVE-2026-42034?
CVE-2026-42034 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-2026-42034?
CVE-2026-42034 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check npm dependencies for CVE-2026-42034?
Run the dependency tree command: 'npm ls axios'. 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-5c9x-8gcm-mpgx",
  "modified" : "2026-05-05T00:33:25Z",
  "published" : "2026-05-05T00:33:25Z",
  "aliases" : [ "CVE-2026-42034" ],
  "summary" : "Axios' HTTP adapter-streamed uploads bypass maxBodyLength when maxRedirects: 0",
  "details" : "### Summary\n\nFor stream request bodies, maxBodyLength is bypassed when maxRedirects is set to 0 (native http/https transport path). Oversized streamed uploads are sent fully even when the caller sets strict body limits.\n\n### Details\n\nRelevant flow in lib/adapters/http.js:\n  - 556-564: maxBodyLength check applies only to buffered/non-stream data.\n  - 681-682: maxRedirects === 0 selects native http/https transport.\n  - 694-699: options.maxBodyLength is set, but native transport does not enforce it.\n  - 925-945: stream is piped directly to socket (data.pipe(req)) with no Axios byte counting.\n\nThis creates a path-specific bypass for streamed uploads.\n\n  ### PoC\n\nEnvironment:\n\n  - Axios main at commit f7a4ee2\n  - Node v24.2.0\n\n  Steps:\n  1. Start an HTTP server that counts uploaded bytes and returns {received}.\n  2. Send a 2 MiB Readable stream with:\n      - adapter: 'http'\n      - maxBodyLength: 1024\n      - maxRedirects: 0\n\n  Observed:\n  - Request succeeds; server reports received: 2097152.\n\n  Control checks:\n  - Same stream with default/nonzero redirects: rejected with ERR_FR_MAX_BODY_LENGTH_EXCEEDED.\n  - Buffered body with maxRedirects: 0: rejected with ERR_BAD_REQUEST.\n\n  ### Impact\nType: DoS / uncontrolled upstream upload / resource exhaustion.\nImpacted: Node.js services using streamed request bodies with maxBodyLength expecting hard enforcement, especially when following Axios guidance to use maxRedirects: 0 for streams.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "axios"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.15.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "axios"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.31.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.31.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/axios/axios/security/advisories/GHSA-5c9x-8gcm-mpgx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42034"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/axios/axios"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-05T00:33:25Z",
    "nvd_published_at" : "2026-04-24T18:16:30Z"
  }
}