CVE-2026-42044Public exploitNetwork attack vector

JSON response tampering via inherited parseReviver

Published Apr 24, 2026 · Updated Apr 24, 2026

Prototype-pollution gadget in Axios 1.0.0 through 1.15.1 allows remote attackers to read and alter JSON response values. The default transformResponse function passes inherited this.parseReviver to JSON.parse without validation, so a polluted Object.prototype function processes every response key. Exploitation requires a separate prototype-pollution path in the application dependency tree and can expose or selectively modify JSON data without changing its overall structure.

CVSS severity6.5
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype-pollution gadget in Axios 1.0.0 through 1.15.1 allows remote attackers to read and alter JSON response values. The default transformResponse function passes inherited this.parseReviver to JSON.parse without validation, so a polluted Object.prototype function processes every response key. Exploitation requires a separate prototype-pollution path in the application dependency tree and can expose or selectively modify JSON data without changing its overall structure.

The record

CVE
CVE-2026-42044
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
Axios
Product
Axios
Classifications
CWE-915, CWE-1321
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

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 1.0.0, < 1.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Axios · Axiosversion=>= 1.0.0, < 1.15.2

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.4Red HatCVSS: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-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Public exploit references

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

Technologies

Your stack

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Your stack

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