CVE-2026-27199 affects Werkzeug versions 3.1.5 and below, where a flaw in the safe_join function allows attackers to trigger an indefinite hang on Windows systems. This occurs when a specially crafted path, including a Windows device name, is passed to the send_from_directory function, leading to a denial of service. The vulnerability has a CVSS score of 5.3 (Medium), indicating a low-complexity attack that can be executed remotely without authentication, resulting in a denial of service. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.1.6CPE matchmatch criteria | cpe:2.3:a:palletsprojects:werkzeug:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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