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CVE-2026-44490 axios CVE debrief

Axios, a promise-based HTTP client for the browser and Node.js, is vulnerable to prototype pollution. This vulnerability, CVE-2026-44490, allows attackers to pollute the Object.prototype, potentially leading to security issues. The vulnerability exists in versions prior to 0.32.0 and 1.16.0. Axios exposes two read-side prototype-pollution gadgets. When Object.prototype is polluted by an upstream dependency in the same process, axios silently picks up the polluted values.

Vendor
axios
Product
Unknown
CVSS
MEDIUM 4.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-06-15
Advisory published
2026-06-11
Advisory updated
2026-06-15

Who should care

Developers and users of Axios, especially those using versions prior to 0.32.0 and 1.16.0, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by two issues in Axios. The first issue is in lib/utils.js, where the merge() function's accumulator is built as an empty object, allowing polluted values from Object.prototype to be copied into the merged headers. The second issue is in lib/core/mergeConfig.js, where the hasOwnProperty descriptor is built as a plain-object literal, allowing polluted Object.prototype.get or Object.prototype.set to cause a TypeError on every axios request.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update Axios to version 0.32.0 or 1.16.0 or later.
  • Review and update dependencies to prevent upstream pollution.

Evidence notes

The CVE-2026-44490 vulnerability has a CVSS score of 4.8 and is classified as MEDIUM severity. The vulnerability was published on 2026-06-11T17:16:33.027Z and modified on 2026-06-11T20:56:29.653Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-44490 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-44490

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-44490 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-44490

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.