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

Quick assessment

Affected
axios axios
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Axios 是一个面向浏览器和 Node.js 的基于 Promise 的 HTTP 客户端。在版本 1.7.0 至 1.20.0 之间，其 fetch 适配器会构造一个带有经过清理的 resolvedOptions 的 Request 对象，但随后仍使用原始的 fetchOptions 调用 fetch 函数。在同一进程中，存在一个独立的通过原型污染漏洞来篡改 Object.prototype.headers 的问题，导致 fetchOptions.headers 通过原型继承解析出值。在构造完 Request

CVSS 6.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
axios axios >= 1.7.0, < 1.20.0 affected
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I. Basic Information for CVE-2026-101908

Vulnerability Information
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Vulnerability Title
Axios: Prototype pollution gadget in fetch adapter can alter outbound requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
axios axios >= 1.7.0, < 1.20.0 -

II. Public POCs for CVE-2026-101908

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III. Intelligence Information for CVE-2026-101908

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Other References for CVE-2026-101908 (4)

Same Patch Batch · axios · 2026-09-28 · 11 CVEs total

CVE-2026-101909 8.3 HIGH Axios: Prototype Pollution Gadget in axios toFormData Options
CVE-2026-101901 8.2 HIGH Axios: Denial of Service via Unhandled 'error' Event in HTTP/2 ClientHttp2Session Initial
CVE-2026-101906 8.2 HIGH Axios: ReDoS (O(N²)) in shouldBypassProxy host normalization, reachable via untrusted redi
CVE-2026-101903 8.2 HIGH Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)
CVE-2026-101905 7.6 HIGH Axios: Node HTTP adapter prototype-pollution gadget allows request socket hijack via inher
CVE-2026-101898 7.0 HIGH Axios: HTTP/2 adapter bypasses configured DNS lookup and proxy controls
CVE-2026-101907 7.0 HIGH Axios: maxRedirects: 0 is not enforced by the fetch adapter, allowing redirect-based SSRF
CVE-2026-101900 6.9 MEDIUM Axios: Fetch Adapter Header Injection via Inherited FormData getHeaders
CVE-2026-101902 6.9 MEDIUM Axios: Prototype-Pollution Gadget in the Default Instance Allows Inherited Object.prototyp
CVE-2026-101904 6.9 MEDIUM Axios: Header Injection via Inherited headers After Minimal Interceptor

IV. Related Vulnerabilities

Same product: axios
Same vendor: axios
Same weakness: CWE-1321

V. Comments for CVE-2026-101908

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