CVE-2025-54364
MEDIUM EPSS 25.1%
Published Aug 20, 202510mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Published Aug 20, 2025 10mo ago
Last Modified Jun 17, 2026 1w ago
Description
Microsoft Knack 0.12.0 allows Regular expression Denial of Service (ReDoS) in the knack.introspection module. option_descriptions employs an inefficient regular expression pattern: "\s(:param)\s+(.+?)\s:(.*)" that is susceptible to catastrophic backtracking when processing crafted docstrings containing a large volume of whitespace without a terminating colon. An attacker who can control or inject docstring content into affected applications can trigger excessive CPU consumption. This software is used by Azure CLI.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
25.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-1333
References 2
- github.com https://github.com/microsoft/knack
- vulncheck.com https://www.vulncheck.com/advisories/microsoft-knack-python-package-regular-expression-dos
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.