# CVE-2022-3095: Incorrect parsing of the backslash characters in Dart library

> Incorrect backslash parsing in Dart URI class allows authentication bypass in web applications interpreting URIs.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Oct 2022
- **Updated:** 21 Apr 2025

## What is CVE-2022-3095?

CVE-2022-3095 is a critical authentication bypass vulnerability in Google LLC Dart, published on 27 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2022-3095?

It affects 2 products.


Products: Dart Dart Software Development Kit, Flutter Flutter.

## How do I fix CVE-2022-3095?

No fix has been published for CVE-2022-3095 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-3095 being exploited?

There is no known exploitation of CVE-2022-3095 in the wild and no public exploit code.

## Other vulnerabilities in Google LLC Dart

- [CVE-2021-22568](https://insights.sbomify.com/CVE-2021-22568/): Dart - Publishing to third-party package repositories may expose pub.dev credentials (high 8.8)
- [CVE-2026-27704](https://insights.sbomify.com/CVE-2026-27704/): Dart SDK and Flutter SDK have Zip slip in Dart Pub package extraction (medium 6.6)
- [CVE-2022-0451](https://insights.sbomify.com/CVE-2022-0451/): Auth bypass in Dark SDK (medium 6.5)
- [CVE-2021-22540](https://insights.sbomify.com/CVE-2021-22540/): XSS in Dart SDK (medium 6.1)
- [CVE-2020-8923](https://insights.sbomify.com/CVE-2020-8923/): XSS in Dart (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3095 and fix it if it is affected.

What it is: CVE-2022-3095 is a critical authentication bypass vulnerability in Google LLC Dart, published on 27 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-3095 in the wild and no public exploit code.

Affected product: Google LLC Dart. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2022-3095/ (Markdown: https://insights.sbomify.com/CVE-2022-3095/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3095
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3095
- OSV: https://osv.dev/vulnerability/CVE-2022-3095

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3095/
Summaries are generated and may contain mistakes; the official description above is the record.