CVE-2026-27199

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

Werkzeug is a comprehensive WSGI web application library. Versions 3.1.5 and below, the safe_join function allows Windows device names as filenames if preceded by other path segments. This was previously reported as GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL. The function send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely. This issue has been fixed in version 3.1.6.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-67

Affected software

No affected versions have been published.

Timeline

Published: Feb 21, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-27206.5The Hr Press Lite plugin for WordPress is vulnerable to unauthorized access of sensitive employee data due to a missing capability check on CVE-2026-272027.5GetSimple CMS is a content management system. All versions of GetSimple CMS have a flaw in the Uploaded Files feature that allows for arbitr CVE-2026-272038.3eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions a CVE-2026-272046.5Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host CVE-2026-272054.3Flask is a web server gateway interface (WSGI) web application framework. In versions 3.1.2 and below, when the session object is accessed, CVE-2026-272068.1Zumba Json Serializer is a library to serialize PHP variables in JSON format. In versions 3.2.2 and below, the library allows deserializatio CVE-2026-272087.8bleon-ethical/api-gateway-deploy provides API gateway deployment. Version 1.0.0 is vulnerable to an attack chain involving OS Command Inject CVE-2026-27214.8The MailArchiver plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, CVE-2026-272106.1Pannellum is a lightweight, free, and open source panorama viewer for the web. In versions 3.5.0 through 2.5.6, the hot spot attributes conf CVE-2026-2721110.0Cloud Hypervisor is a Virtual Machine Monitor for Cloud workloads. Versions 34.0 through 50.0 arevulnerable to arbitrary host file exfiltrat CVE-2026-272127.8Swiper is a free and mobile touch slider with hardware accelerated transitions and native behavior. Versions 6.5.1 through 12.1.1 have a Pro CVE-2026-272145.5Substance3D - Painter versions 11.1.2 and earlier are affected by a NULL Pointer Dereference vulnerability that could lead to application de