CVE-2026-22685: DevToys Path Traversal (“Zip Slip”) Vulnerability in DevToys Extension Installation

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-10 · updated 2026-06-17
Weakness: CWE-22

Description

DevToys is a desktop app for developers. In versions from 2.0.0.0 to before 2.0.9.0, a path traversal vulnerability exists in the DevToys extension installation mechanism. When processing extension packages (NUPKG archives), DevToys does not sufficiently validate file paths contained within the archive. A malicious extension package could include crafted file entries such as ../../…/target-file, causing the extraction process to write files outside the intended extensions directory. This flaw enables an attacker to overwrite arbitrary files on the user’s system with the privileges of the DevToys process. Depending on the environment, this may lead to code execution, configuration tampering, or corruption of application or system files. This issue has been patched in version 2.0.9.0.

Affected products

DevToys-app DevToys: from 2.0.1.0 before 2.0.9.0 — fixed in 2.0.9.0

How to fix

Upgrade to a fixed version: DevToys-app DevToys 2.0.9.0. Check the vendor advisory for mitigations.

References

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