CVE-2022-3095

Incorrect parsing of the backslash characters in Dart library

State: Published
Severity: 9.8 Critical
Published: Oct 27, 2022
Updated: Apr 21, 2025
Reserved: Sep 2, 2022

Description

The implementation of backslash parsing in the Dart URI class for versions prior to 2.18 and Flutter versions prior to 3.30 differs from the WhatWG URL standards. Dart uses the RFC 3986 syntax, which creates incompatibilities with the '\' characters in URIs, which can lead to auth bypass in webapps interpreting URIs. We recommend updating Dart or Flutter to mitigate the issue.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Google

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
DartGoogle LLC	stable to before 2.18.2Affected Flutter to before 3.3.3Affected

References

https://github.com/dart-lang/sdk/blob/master/CHANGELOG.md#2182---2022-09-28

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