CVE-2022-3095
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Dart URI class uses RFC 3986 syntax for backslash parsing, which differs from the WhatWG URL standard used by web browsers. This causes URIs containing backslashes (e.g., http://example.com\evil.com) to be parsed differently—Dart interprets the backslash as part of the path, while browsers interpret it as part of the hostname. This discrepancy can enable authentication bypass in web applications that rely on URI parsing for security decisions.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 2.18.0< 3.3.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Dart SDK versionRun `dart --version` in your terminal or inspect the pubspec.lock file for the sdk version entryAffected if The reported version is earlier than 2.18.0 (e.g., 2.17.x, 2.16.x, etc.)
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Check Flutter SDK versionRun `flutter --version` in your terminal, or check the Flutter installation directory for the version fileAffected if The reported version is earlier than 3.3.3 (e.g., 3.3.2, 3.3.1, 3.3.0, etc.)
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Identify if your application parses user-supplied URIsReview your codebase for uses of the Uri class or url parsing logic that processes input from external sources (query parameters, headers, form inputs)Affected if Your code uses Dart's Uri class to parse and make security decisions (such as allowlists, authentication checks, or redirection logic) on URIs that may contain backslashes
You are affected if you run Dart SDK below 2.18.0 or Flutter below 3.3.3 AND your application relies on Dart URI parsing for security decisions involving URIs with backslashes.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped2.18.03.3.3
Update Dart to version 2.18 or later, or Flutter to version 3.30 or later, to align URI parsing with WhatWG standards.
Dart SDK 2.18.0 or Flutter 3.3.3
- Check current Dart SDK version using: dart --version
- Check current Flutter version using: flutter --version
- For Dart-only projects: Run 'dart pub upgrade' or download Dart SDK 2.18.0 from dart.dev
- For Flutter projects: Run 'flutter upgrade' to update to Flutter 3.3.3 or later
- Verify the update was successful by re-running the version commands
- Test URI parsing functionality in your application to confirm the backslash handling is now compliant with WhatWG standards
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,072.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-3095 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-3095 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data