CVE-2026-42035Public exploitNetwork attack vector

Header injection via polluted FormData duck typing

Published Apr 24, 2026 · Updated Apr 24, 2026

HTTP header injection in the Axios Node.js HTTP adapter before 0.31.1 and 1.0.0 through 1.15.0 allows remote attackers to alter requests. Polluted Object.prototype members satisfy FormData duck-type checks, causing lib/adapters/http.js to call an inherited getHeaders function and merge its output. Exploitation requires another prototype-pollution primitive and an Axios request with a data payload; injected headers can alter downstream authentication or session semantics.

CVSS severity7.4
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

HTTP header injection in the Axios Node.js HTTP adapter before 0.31.1 and 1.0.0 through 1.15.0 allows remote attackers to alter requests. Polluted Object.prototype members satisfy FormData duck-type checks, causing lib/adapters/http.js to call an inherited getHeaders function and merge its output. Exploitation requires another prototype-pollution primitive and an Axios request with a data payload; injected headers can alter downstream authentication or session semantics.

The record

CVE
CVE-2026-42035
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
Axios
Product
Axios
Classifications
CWE-1321, CWE-113
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.31.1
  2. Affected versionversion=>= 1.0.0, < 1.15.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Axios · Axiosversion=< 0.31.1; version=>= 1.0.0, < 1.15.1

Published CVSS scores

7.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo