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CVE-2026-55553— urllib: Cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage

Quick assessment

Affected
node-modules urllib
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.

urllib 是 Node.js 的一个 HTTP 客户端，支持身份验证、重定向、超时以及其他请求功能。在 4.9.1 和 2.44.1 版本之前，urllib 通过 followRedirect 机制处理重定向请求，但会跨不同源（origin）重复使用调用方提供的选项（options）。具体而言，在 src/HttpClient.ts 文件中，#requestInternal 方法会递归调用 this.#requestInternal(nextUrl.href, options, requestContext)，

CVSS 7.5 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
node-modules urllib >= 3.0.0, < 4.9.1 affected
< 2.44.1 affected
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I. Basic Information for CVE-2026-55553

Vulnerability Information
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Vulnerability Title
urllib: Cross-origin redirects preserve credential-bearing request headers, leading to potential credential leakage
Source: CVE Program / CVE List V5
Vulnerability Description
urllib is an HTTP client for Node.js that supports authentication, redirects, timeouts, and other request features. Prior to 4.9.1 and 2.44.1, urllib follows redirects through followRedirect but reuses caller-supplied options across origins. In src/HttpClient.ts, #requestInternal recursively calls this.#requestInternal(nextUrl.href, options, requestContext), causing options.headers and auth or digestAuth values to be reused when the redirect target has a different scheme, host, or port. Authorization, Cookie, Proxy-Authorization, x-api-key, x-auth-token, and x-access-token can therefore be sent to an attacker-controlled redirected origin, exposing credentials intended for the original origin and potentially allowing reuse against the original partner API or related services. No user interaction is required. This issue is fixed in versions 2.44.1 and 4.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
node-modules urllib >= 3.0.0, < 4.9.1 -

II. Public POCs for CVE-2026-55553

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III. Intelligence Information for CVE-2026-55553

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Patches & Fixes for CVE-2026-55553 (4)

Vendor Advisories for CVE-2026-55553 (1)

Other References for CVE-2026-55553 (2)

IV. Related Vulnerabilities

Same vendor: node-modules
Same weakness: CWE-200

V. Comments for CVE-2026-55553

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