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CVE-2026-103030— Dio: Cross-origin redirect leaks sensitive request headers in `dio_http2_adapter`

Quick assessment

Affected
cfug dio
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.

Dio 是 Dart 和 Flutter 中一个功能强大的 HTTP 客户端库。从版本 1.0.0 到 2.8.0 期间，dio_http2_adapter 在 Http2Adapter._fetch 方法中处理重定向时，会将原始 RequestOptions.headers 直接复制到重定向后的 HTTP/2 请求中，而未比较源地址与目标地址的源（origin）。攻击者控制的服务器可以返回指向不同源的目标地址的跨源 Location 重定向，而目标地址会保留原有的 Authorization、Cookie 和 P

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
cfug dio >= 1.0.0, < 2.8.0 affected
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I. Basic Information for CVE-2026-103030

Vulnerability Information
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Vulnerability Title
Dio: Cross-origin redirect leaks sensitive request headers in `dio_http2_adapter`
Source: CVE Program / CVE List V5
Vulnerability Description
Dio is a powerful HTTP client for Dart and Flutter. From 1.0.0 until 2.8.0, dio_http2_adapter follows redirects in Http2Adapter._fetch by copying the original RequestOptions.headers into the redirected HTTP/2 request without comparing the source and destination origins. A server contacted by an application can return a cross-origin Location redirect to a different-origin destination, which then receives preserved Authorization, Cookie, and Proxy-Authorization headers because RequestOptions.copyWith retains the full header map. The issue applies when applications use Http2Adapter for authenticated requests, and redirect following is enabled by default. This issue is fixed in version 2.8.0.
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
cfug dio >= 1.0.0, < 2.8.0 -

II. Public POCs for CVE-2026-103030

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III. Intelligence Information for CVE-2026-103030

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Patches & Fixes for CVE-2026-103030 (2)

Vendor Advisories for CVE-2026-103030 (1)

IV. Related Vulnerabilities

Same weakness: CWE-200

V. Comments for CVE-2026-103030

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