This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-81563 →

DEBIAN-CVE-2026-81563

A BIND resolver encountering an SVCB/HTTPS AliasMode record referencing 14 or more SVCB/HTTPS ServiceMode records may fail to properly deallocate inte...

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 bind9

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 bind9

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.29-1~deb13u1"}]}]

Debian:14 bind9

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.20.29-1"}]}]

References

advisory security-tracker.debian.org