CVE-2025-48945

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

No CVSS.

References

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

Configurations

No configuration.

History

23 Jun 2025, 20:16

Type	Values Removed	Values Added
Summary		(es) Pycares es un módulo de Python que proporciona una interfaz para c-ares. C-ares es una librería de C que realiza solicitudes DNS y resoluciones de nombres de forma asíncrona. En versiones anteriores a la 4.9.0, Pycares era vulnerable a una condición de use-after-free que se produce cuando un objeto de canal se recolecta como basura mientras las consultas DNS aún están pendientes. Esto provoca un error fatal de Python y un fallo del intérprete. Esta vulnerabilidad se ha corregido en Pycares 4.9.0 mediante la implementación de un mecanismo seguro de destrucción de canales.

20 Jun 2025, 20:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-06-20 20:15

Updated : 2025-06-23 20:16

NVD link : CVE-2025-48945

Mitre link : CVE-2025-48945

CVE.ORG link : CVE-2025-48945

JSON object : View

Products Affected

No product.

CWE

CWE-416

Use After Free

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