# CVE-2021-22568: Dart - Publishing to third-party package repositories may expose pub.dev credentials

> Publishing to third-party servers exposes pub.dev credentials, allowing attackers to impersonate users on pub.dev.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Dec 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-r32f-vhjp-qhj7

## What is CVE-2021-22568?

CVE-2021-22568 is a high-severity vulnerability in Google LLC Dart SDK, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

When using the dart pub publish command to publish a package to a third-party package server, the request would be authenticated with an oauth2 access_token that is valid for publishing on pub.dev. Using these obtained credentials, an attacker can impersonate the user on pub.dev. We recommend upgrading past https://github.com/dart-lang/sdk/commit/d787e78d21e12ec1ef712d229940b1172aafcdf8 or beyond version 2.15.0

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere), CWE-255

## Which versions are affected by CVE-2021-22568?

It affects 1 product.


Products: Dart Dart Software Development Kit.

## How do I fix CVE-2021-22568?

No fix has been published for CVE-2021-22568 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22568 being exploited?

There is no known exploitation of CVE-2021-22568 in the wild and no public exploit code.

## Other vulnerabilities in Google LLC Dart SDK

- [CVE-2022-3095](https://insights.sbomify.com/CVE-2022-3095/): Incorrect parsing of the backslash characters in Dart library (critical 9.8)
- [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-2021-22568 and fix it if it is affected.

What it is: CVE-2021-22568 is a high-severity vulnerability in Google LLC Dart SDK, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-22568 in the wild and no public exploit code.

Affected product: Google LLC Dart SDK. 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-2021-22568/ (Markdown: https://insights.sbomify.com/CVE-2021-22568/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22568
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22568
- OSV: https://osv.dev/vulnerability/CVE-2021-22568

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22568/
Summaries are generated and may contain mistakes; the official description above is the record.