CVE-2026-102598: medium-severity vulnerability in pallets werkzeug
Werkzeug safe_join() allows Windows special device names
Published
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.3epss 0.4%
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
Werkzeug is a comprehensive WSGI web application library. Prior to 3.1.9, the safe_join function used by send_from_directory can allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty NTFS ADS marker. The trigger is that an application runs on Windows with NTFS and serves a user-specified path ending in a special device name such as NUL:. The attack mechanism is that a requested path ends in a Windows special device name with an empty ADS marker. The impact is that the special device opens successfully and the file read hangs indefinitely. This issue is fixed in version 3.1.9.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products
pallets · werkzeugRelated CVEs — pallets werkzeug
In the same product, most dangerous first.
CVE-2024-34069HIGHWerkzeug's improper usage of a pathname and improper CSRF protection results in the remote command executionEPSS 3.4%CVE-2023-25577HIGHWerkzeug may allow high resource usage when parsing multipart form data with many fieldsEPSS 1.4%CVE-2024-49767MEDIUMWerkzeug possible resource exhaustion when parsing file data in formsEPSS 1.1%CVE-2023-46136HIGHWerkzeug vulnerable to high resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginningEPSS 1.1%CVE-2024-49766MEDIUMWerkzeug safe_join not safe on WindowsEPSS 0.8%CVE-2026-27199MEDIUMWerkzeug safe_join() allows Windows special device namesEPSS 0.5%