Palletsprojects Werkzeug vulnerabilities

CVE-2026-27199 [MEDIUM] CWE-67 CVE-2026-27199: Werkzeug is a comprehensive WSGI web application library. Versions 3.1.5 and below, the safe_join fu 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

CVE-2026-21860 [MEDIUM] CWE-67 CVE-2026-21860: Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.5, Werkzeug's safe_jo Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.5, Werkzeug's safe_join function allows path segments with Windows device names that have file extensions or trailing spaces. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. Windows still accepts

CVE-2025-66221 [MEDIUM] CWE-67 CVE-2025-66221: Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.4, Werkzeug's safe_jo Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.4, Werkzeug's safe_join function allows path segments with Windows device names. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. send_from_directory uses safe_join to safely serve files at user-s

CVE-2024-49767 [MEDIUM] CWE-400 CVE-2024-49767: Werkzeug is a Web Server Gateway Interface web application library. Applications using `werkzeug.for Werkzeug is a Web Server Gateway Interface web application library. Applications using `werkzeug.formparser.MultiPartParser` corresponding to a version of Werkzeug prior to 3.0.6 to parse `multipart/form-data` requests (e.g. all flask applications) are vulnerable to a relatively simple but effective resource exhaustion (denial of service) attack. A

CVE-2024-49766 [MEDIUM] CWE-22 CVE-2024-49766: Werkzeug is a Web Server Gateway Interface web application library. On Python < 3.11 on Windows, os. Werkzeug is a Web Server Gateway Interface web application library. On Python = 3.11, or not using Windows, are not vulnerable. Werkzeug version 3.0.6 contains a patch.

CVE-2024-34069 [HIGH] CWE-352 CVE-2024-34069: Werkzeug is a comprehensive WSGI web application library. The debugger in affected versions of Werkz Werkzeug is a comprehensive WSGI web application library. The debugger in affected versions of Werkzeug can allow an attacker to execute code on a developer's machine under some circumstances. This requires the attacker to get the developer to interact with a domain and subdomain they control, and enter the debugger PIN, but if they are successful it

CVE-2023-46136 [HIGH] CWE-400 CVE-2023-46136: Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of servic

CVE-2023-25577 [HIGH] CWE-770 CVE-2023-25577: Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipa Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses `r

CVE-2023-23934 [LOW] CWE-20 CVE-2023-23934: Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__

CVE-2022-29361 [CRITICAL] CWE-444 CVE-2022-29361: Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform H Improper parsing of HTTP requests in Pallets Werkzeug v2.1.0 and below allows attackers to perform HTTP Request Smuggling using a crafted HTTP request with multiple requests included inside the body. NOTE: the vendor's position is that this behavior can only occur in unsupported configurations involving development mode and an HTTP server from out

CVE-2020-28724 [MEDIUM] CWE-601 CVE-2020-28724: Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL. Open redirect vulnerability in werkzeug before 0.11.6 via a double slash in the URL.

CVE-2019-14806 [HIGH] CWE-331 CVE-2019-14806: Pallets Werkzeug before 0.15.3, when used with Docker, has insufficient debugger PIN randomness beca Pallets Werkzeug before 0.15.3, when used with Docker, has insufficient debugger PIN randomness because Docker containers share the same machine id.

CVE-2019-14322 [HIGH] CWE-22 CVE-2019-14322: In Pallets Werkzeug before 0.15.5, SharedDataMiddleware mishandles drive names (such as C:) in Windo In Pallets Werkzeug before 0.15.5, SharedDataMiddleware mishandles drive names (such as C:) in Windows pathnames.

CVE-2016-10516 [MEDIUM] CWE-79 CVE-2016-10516: Cross-site scripting (XSS) vulnerability in the render_full function in debug/tbtools.py in the debu Cross-site scripting (XSS) vulnerability in the render_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11 (as used in Pallets Flask and other products) allows remote attackers to inject arbitrary web script or HTML via a field that contains an exception message.