CVE-2026-44490Public exploitNetwork attack vector

Header injection and request failure via prototype reads

Published Jun 11, 2026 · Updated Jun 11, 2026

Prototype-pollution gadgets in Axios before 0.32.0 and 1.0.0 through 1.15.2 allow attackers to inject headers or interrupt requests. The utils merge accumulator reads inherited buckets and copies their keys into outbound headers, while mergeConfig passes an inheriting descriptor to Object.defineProperty. Exploitation requires another dependency to pollute Object.prototype in the same process; affected requests then carry attacker-selected headers or fail synchronously with TypeError.

CVSS severity4.8
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype-pollution gadgets in Axios before 0.32.0 and 1.0.0 through 1.15.2 allow attackers to inject headers or interrupt requests. The utils merge accumulator reads inherited buckets and copies their keys into outbound headers, while mergeConfig passes an inheriting descriptor to Object.defineProperty. Exploitation requires another dependency to pollute Object.prototype in the same process; affected requests then carry attacker-selected headers or fail synchronously with TypeError.

The record

CVE
CVE-2026-44490
Published
Jun 11, 2026
Updated
Jun 11, 2026
Vendor
Axios
Product
Axios
Classifications
CWE-1321, T1565.002, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 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=< 0.32.0
  2. Affected versionversion=>= 1.0.0, < 1.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Axios · Axiosversion=< 0.32.0; version=>= 1.0.0, < 1.16.0

Published CVSS scores

8.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
4.8GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

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')
T1565.002Transmitted Data Manipulation
T1499.004Application or System Exploitation

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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