← Vulnerability feed

Vulnerability record · CVE-2026-81563 · published 16 September 2026

CVE-2026-81563: Memory leak vulnerability

A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

7.5 CVSS 3.1 High EPSS 0.67% · top 49.9% CWE-401 · Memory leak Awaiting Analysis
7.5CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Sep 2026Last modified by NVD

Description

A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate internal resources. If this happens repeatedly, resource exhaustion will eventually prevent the resolver from performing new recursive lookups. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

LinkTags
https://downloads.isc.org/isc/bind9/9.20.29
https://downloads.isc.org/isc/bind9/9.21.26
https://kb.isc.org/docs/cve-2026-81563

Track CVE-2026-81563 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

3.3CVE-2023-26083Arm Mali GPU Kernel Driver memory leak exposes kernel metadataThe Arm Mali GPU kernel driver has a memory leak (CWE-401) across Midgard r6p0-r32p0, Bifrost r0p0-r42p0, Valhall r19p0-r42p0, and Avalon r41p0-r42p0…KEVEPSS 1.2%analysed8.6CVE-2018-0158Cisco IOS and IOS XE IKEv2 packet handling memory leak DoSCisco IOS and IOS XE mishandle certain IKEv2 packets, causing improper input validation that leaks memory. Repeated crafted packets drive continuous …KEVEPSS 7.2%analysed

Source: NIST National Vulnerability Database (record CVE-2026-81563), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.