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Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M

CVE-2026-101908Axios: Prototype pollution gadget in fetch adapter can alter outbound requests

Medium 6.9

In plain English

A medium-severity prototype pollution in axios from axios. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.5%top 59.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

Axios is a promise-based HTTP client for the browser and Node.js. From 1.7.0 until 1.20.0, the fetch adapter constructs a Request with sanitized resolvedOptions but then calls fetch with the original fetchOptions. A separate same-process prototype-pollution flaw populates Object.prototype.headers so fetchOptions.headers resolves through inheritance. The inherited fetchOptions.headers value overrides the sanitized Request headers through the second argument to fetch after Request construction. Attacker-controlled request headers can alter authorization, caching, metadata-service access, or application-specific behavior. This issue is fixed in version 1.20.0.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13node-axiosno fix listedDEBIAN-CVE-2026-101908
Debian:14node-axios1.20.0-1DEBIAN-CVE-2026-101908
Ubuntu:26.10node-axiosno fix listedUBUNTU-CVE-2026-101908
npmaxios1.20.0GHSA-vh66-26gq-q6x8

Affected products (as reported)

VendorProductVersions
axios axios >= 1.7.0, < 1.20.0

Weakness: CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N

References