Authentication bypass via backslash URL parsing
Published Oct 27, 2022 · Updated Apr 21, 2025
URL validation bypass in the dart:core URI implementation in Google Dart SDK before 2.18.2 allows remote attackers to evade host checks. The Uri constructor and Uri.parse treat backslashes as ordinary RFC 3986 path characters instead of browser-style separators, so validation and later browser interpretation can resolve different hosts. Exploitation requires a web application to validate an attacker-supplied URI with Dart and then use it in a browser context, enabling unauthorized destinations, data disclosure, or cross-site scripting.
Summary
What happened
URL validation bypass in the dart:core URI implementation in Google Dart SDK before 2.18.2 allows remote attackers to evade host checks. The Uri constructor and Uri.parse treat backslashes as ordinary RFC 3986 path characters instead of browser-style separators, so validation and later browser interpretation can resolve different hosts. Exploitation requires a web application to validate an attacker-supplied URI with Dart and then use it in a browser context, enabling unauthorized destinations, data disclosure, or cross-site scripting.
The record
- CVE
- CVE-2022-3095
- Published
- Oct 27, 2022
- Updated
- Apr 21, 2025
- Vendor
- Product
- Dart SDK
- Classifications
- CWE-20, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 27, 2022CVE publishedPublication date reported by the CVE source.
- Apr 21, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Flutter <3.3.3
- Affected versionversion=stable <2.18.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo