CVE-2026-27704Network attack vector

Arbitrary file write via symlink path traversal

Published Feb 25, 2026 · Updated Feb 25, 2026

Path traversal in Google Dart SDK before 3.11.0 and Flutter SDK before 3.41.0 allows attackers to write files outside PUB_CACHE. The pub tar extractor joins an entry name before normalizing it, so a symlink followed by parent-directory segments passes its destination check but resolves outside the cache. Exposure requires a malicious archive from an untrusted package repository; vetted pub.dev packages, trusted repositories, and git dependencies are unaffected.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Google Dart SDK before 3.11.0 and Flutter SDK before 3.41.0 allows attackers to write files outside PUB_CACHE. The pub tar extractor joins an entry name before normalizing it, so a symlink followed by parent-directory segments passes its destination check but resolves outside the cache. Exposure requires a malicious archive from an untrusted package repository; vetted pub.dev packages, trusted repositories, and git dependencies are unaffected.

The record

CVE
CVE-2026-27704
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Go standard library
Product
Dart SDK
Classifications
CWE-22, T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Dart SDKversion=< 3.11.0
Go standard library · Flutter SDKversion=< 3.41.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1195.001Compromise Software Dependencies and Development Tools

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

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Your stack

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