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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-103030
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 17:17:14 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionDio 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003590000 probability, percentile 0.280480000 (date 2026-10-16)

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cfug Dio affected >= 1.0.0, < 2.8.0 Not specified

References

ReferenceSourceLinkTags
github.com/cfug/dio/releases/tag/http2_adapter_v2.8.0 [email protected] github.com
github.com/cfug/dio/commit/9d7ac913340084f3b4987b121e076f28d637a81e [email protected] github.com
github.com/cfug/dio/security/advisories/GHSA-cr65-55v9-xhvv 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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