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CVE-2026-101903— Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)

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 是一个基于 Promise 的 HTTP 客户端，适用于浏览器和 Node.js 环境。在版本 1.16.1 至 1.20.0 之间，其用于处理 RFC 2397 数据 URL 的正则表达式存在缺陷，允许在媒体类型分隔符（逗号）的两侧包含斜杠字符（/）。当应用程序传入一个由攻击者构造的、包含大量斜杠字符但缺少逗号的数据 URL 时，JavaScript 正则表达式引擎会尝试多种分隔符放置方式，最终才拒绝该非法 URL。这一过程会导致同步过度回溯（synchronous excessive backtra

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
axios axios >= 1.16.1, < 1.20.0 affected
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I. Basic Information for CVE-2026-101903

Vulnerability Information
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Vulnerability Title
Axios: ReDoS in fromDataURI data: URL parser freezes the Node event loop (DoS)
Source: CVE Program / CVE List V5
Vulnerability Description
Axios is a promise-based HTTP client for the browser and Node.js. From 1.16.1 until 1.20.0, the RFC 2397 regular expression allows slash characters on both sides of the media-type separator. An application passes an attacker-controlled malformed data URL containing many slash characters and no comma. the JavaScript regular-expression engine explores many separator placements before rejecting the URL. Synchronous excessive backtracking can block the Node.js event loop and cause denial of service. The affected identifiers are fromDataURI, DATA_URL_PATTERN, data:. 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:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
axios axios >= 1.16.1, < 1.20.0 -

II. Public POCs for CVE-2026-101903

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III. Intelligence Information for CVE-2026-101903

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Other References for CVE-2026-101903 (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-2026-101905 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
CVE-2026-101908 6.9 MEDIUM Axios: Prototype pollution gadget in fetch adapter can alter outbound requests

IV. Related Vulnerabilities

Same product: axios
Same vendor: axios
Same weakness: CWE-1333

V. Comments for CVE-2026-101903

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