CVE-2025-48945
High
Description
pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.
SeverityHigh
CVSS8.2
Exploit probability—
ProductPycares
PublishedJun 20, 2025
First seenJun 20, 2025
Weakness typeCWE-416Use after free
How to fix
Update
- pycares4.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pycaresPyPI | v < 4.9.0 | 4.9.0 |
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