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c-ares has a Use After Free vulnerability when connection is cleaned up after error

🗓️ 11 Dec 2025 09:01:47Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 1 Views

Microsoft reports a Use After Free vulnerability in c-ares when cleaning up a connection after an error.

Related
Detection
ReporterTitlePublishedViews
Family
FreeBSD		c-ares -- Use After Free
8 Dec 202500:00
–freebsd
IBM Security Bulletins		Security Bulletin: Denial of Service Vulnerability in c-ares Resolver (Versions 1.32.3–1.34.5), affects watsonx.data
6 Apr 202607:23
–ibm
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in IBM Observability with Instana (OnPrem)
29 Jan 202613:44
–ibm
Tenable Nessus		Amazon Linux 2023 : nodejs20, nodejs20-devel, nodejs20-full-i18n (ALAS2023-2025-1346)
8 Jan 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : nodejs22, nodejs22-devel, nodejs22-full-i18n (ALAS2023-2025-1347)
8 Jan 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : nodejs24, nodejs24-devel, nodejs24-full-i18n (ALAS2023-2025-1348)
8 Jan 202600:00
–nessus
Tenable Nessus		Debian dsa-6084 : libc-ares-dev - security update
18 Dec 202500:00
–nessus
Tenable Nessus		Fedora 43 : nodejs20 (2026-f601b2f60a)
31 Jan 202600:00
–nessus
Tenable Nessus		Fedora 42 : nodejs20 (2026-fb4878551d)
31 Jan 202600:00
–nessus
Tenable Nessus		FreeBSD : c-ares -- Use After Free (1adf9ece-d4a3-11f0-83a2-843a4b343614)
12 Dec 202500:00
–nessus
Rows per page
Vulners
Node
microsoftazl3_fluent-bit_3.1.10-4Range<3.1.10-4
OR
microsoftazl3_fluent-bit_3.1.10-2Range<3.1.10-4

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08 Jan 2026 22:43Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.15.9
EPSS0.00023
SSVC
Use After FreeConnection cleanupError handlingCares vulnerabilityMicrosoft
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