Vulnerability advisory

CVE-2026-103030

Dio: Cross-origin redirect leaks sensitive request headers in `dio_http2_adapter`

Published Oct 13, 2026Updated Oct 28, 2026OSV record ↗

Severity

CVSS 3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected versions

Repository

Affected commits	Fixed by commit
GIT github.com/cfug/dio ↗
All commits before 9d7ac913340084f3b4987b121e076f28d637a81e	`9d7ac913340084f3b4987b121e076f28d637a81e`
Not specified	`9d6f43eda20af11ffff92e6f6ee710f0d03ffe9b`
Also listed as affected (88) `dio_v5.10.0` `web_adapter_v2.2.0` `native_dio_adapter_v1.6.0` `http2_adapter_v2.7.1` `dio_v5.9.2` `compatibility_layer_v0.1.1` `cookie_manager_v3.4.0` `http2_adapter_v2.7.0` `web_adapter_v2.1.2` `dio_v5.9.1` `native_dio_adapter_v1.5.1` `dio_v5.9.0` `cookie_manager_v3.3.0` `native_dio_adapter_v1.5.0` `web_adapter_v2.1.1` `dio_v5.8.0+1` `http2_adapter_v2.6.0` `web_adapter_v2.1.0` `dio_v5.8.0` `cookie_manager_v3.2.0` `native_dio_adapter_v1.4.0` `dio_v5.7.0` `dio_v5.6.0` `web_adapter_v2.0.0` `dio_v5.5.0+1` `web_adapter_v1.0.1` `dio_v5.5.0` `http2_adapter_v2.5.3` `web_adapter_v1.0.0` `dio_v5.4.3+1` `dio_v5.4.3` `http2_adapter_v2.5.2` `dio_v5.4.2+1` `dio_v5.4.2` `http2_adapter_v2.5.1` `http2_adapter_v2.5.0` `dio_v5.4.1` `compatibility_layer_v0.1.0` `native_dio_adapter_v1.3.0` `http2_adapter_v2.4.0` `native_dio_adapter_v1.2.0` `dio_v5.4.0` `dio_v5.3.4` `http2_adapter_v2.3.2` `native_dio_adapter_v1.1.1` `native_dio_adapter_v1.1.0` `cookie_manager_v3.1.1` `dio_v5.3.3` `dio_v5.3.2` `cookie_manager_v3.1.0+1` `http2_adapter_v2.3.1+1` `native_dio_adapter_v1.0.0+2` `dio_v5.3.1` `http2_adapter_v2.3.1` `dio_v5.3.0` `dio_v5.2.1+1` `dio_v5.2.1` `dio_v5.2.0+1` `native_dio_adapter_v1.0.0+1` `http2_adapter_v2.3.0` `cookie_manager_v3.1.0` `dio_v5.2.0` `dio_v5.1.2` `cookie_manager_v3.0.0` `cookie_manager_v2.1.4` `dio_v5.1.1` `http2_adapter_v2.2.0` `dio_v5.1.0` `cookie_manager_v2.1.3` `dio_v5.0.3` `native_dio_adapter_v0.1.0` `cookie_manager_v2.1.2` `dio_v5.0.2` `cookie_manager_v2.1.1` `dio_v5.0.1` `v5.0.0` `4.0.3` `4.0.2` `4.0.2-beta1` `4.0.1` `4.0.0` `3.0.10` `3.0.9` `3.0.8` `3.0.6` `3.0.5` `3.0.2` `3.0.0`

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.

CVE-2026-103030

Affected versions

Repository

Description

References