Is this vulnerability remotely exploitable?

It can be, if the developer environment or build system automatically downloads and extracts packages from a source that an attacker can control or influence (for example, a compromised repository or tampered package feed). If all package sources are trusted and vetted, practical exploitability is significantly reduced.

What level of access does an attacker need to exploit this issue?

The attacker must be able to provide or modify a package archive that will be processed by `dart pub` or `flutter pub`. This could be via a malicious package in an untrusted registry, a man-in-the-middle scenario affecting downloads, a compromised internal mirror, or local tampering with package files before extraction.

What is the safest general fix pattern for similar bugs?

The most robust fix is to canonicalize every target path (including symlink resolution) and enforce that the final path remains inside a predefined root directory, rejecting any entry that attempts to escape that root. Additionally, either prohibit symlinks in archives altogether or handle them in a way that does not allow redirection outside the extraction boundary.

Severity:

HIGH RISK

(7.5)

Path Traversal via Symlink in pub Cache Extraction (CWE-22) in Dart and Flutter SDKs

CVE-2026-27704

Published:

Feb 25, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Path Traversal / Directory Traversal

CWE:

CWE-22

Impact:

File System Manipulation within PUB_CACHE

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / Directory Traversal

CWE:

CWE-22

Impact:

File System Manipulation within PUB_CACHE

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Path Traversal via Symlink in pub Cache Extraction (CWE-22) in Dart and Flutter SDKs

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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