Python
CVE-2025-6075
LOW
Severity by source
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/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
Primary rating from Vendor (python) · only source for this CVE.
CVSS VectorVendor: python
Lifecycle Timeline
2DescriptionCVE.org
If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.
AnalysisAI
Performance degradation in Python's os.path.expandvars() can be triggered by a local attacker with high privileges who supplies crafted input containing environment variable syntax to that function. Both the POSIX (posixpath.py) and Windows (ntpath.py) implementations were affected, as their manual character-by-character loop logic exhibited algorithmic complexity issues under adversarial input. No public exploit is identified at time of analysis, and an EPSS score of 0.14% at the 4th percentile signals negligible exploitation probability.
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today