openEuler 24.03 LTS SP1 update for python-pycares

1) Use-after-free

EUVDB-ID: #VU112888

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-48945

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error caused by improper handling of callback references when the Channel object is destroyed. A remote attacker can send specially crafted DNS queries to the affected application and perform a denial of service attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

openEuler: 24.03 LTS SP1

python3-pycares: before 4.9.0-1

python-pycares-help: before 4.9.0-1

python-pycares-debugsource: before 4.9.0-1

python-pycares-debuginfo: before 4.9.0-1

python-pycares: before 4.9.0-1

CPE2.3

• cpe:2.3:o:openeuler:openeuler:24.03:LTS SP1:*:*:*:*:*:*
• cpe:2.3:a:openeuler:python3-pycares:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:python-pycares-help:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:python-pycares-debugsource:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:python-pycares-debuginfo:*:*:*:*:*:openeuler:*:*
• cpe:2.3:a:openeuler:python-pycares:*:*:*:*:*:openeuler:*:*

External links

https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2025-1810

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.