CVE-2025-48945

HIGH EPSS 30.8%
Published Jun 20, 20251y ago · Modified Jun 17, 20262w ago
8.2 CVSS 4.0
High
Find Similar
Published Jun 20, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
8.2
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/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 Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
30.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

References 5

  • github.com https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55
  • github.com https://github.com/aio-libs/aiodns/releases/tag/v3.5.0
  • github.com https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4
  • github.com https://github.com/saghul/pycares/releases/tag/v4.9.0
  • github.com https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.