CVE-2026-109125

In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold 0' configurations not a default configuration. If a response-like UDP datagram reaches the upstream source port currently used by a recursive query, but i...

CVE-2026-109125

NLnet Labs Unbound up to and including version 1.26.1 is vulnerable to a cache-level side-channel when configured with unwanted-reply-threshold > 0 (which is not the default). The vulnerability occurs because Unbound counts response-like UDP datagrams that do not match a pending query's TXID as

CVE-2026-109125 Possible cache poisoning vulnerability via a cache side-channel exposed by 'unwanted-reply-threshold'

In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold 0' configurations not a default configuration. If a response-like UDP datagram reaches the upstream source port currently used by a recursive query, but i...

EUVD-2026-107150

In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold 0' configurations not a default configuration. If a response-like UDP datagram reaches the upstream source port currently used by a recursive query, but i...

EulerOS 2.0 SP13 : unbound (EulerOS-SA-2026-4111)

According to the versions of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: unbound (UTSA-2026-104806)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104806 advisory. In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of 0.0.0.0/::0...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: unbound (UTSA-2026-104809)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104809 advisory. With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with 'unwanted-reply-threshold', could eventually be abruptl...

CVE-2026-44621

A flaw was found in libunbound, a library used by applications for DNS resolution. A remote attacker could exploit this vulnerability by sending specially crafted network traffic. This could cause applications using libunbound to terminate unexpectedly, leading to a denial of service DoS. This...

Important: unbound

Issue Overview: In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to...

Amazon Linux 2023 : python3-unbound, unbound, unbound-anchor (ALAS2023-2026-2033)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2033 advisory. In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the...

Amazon Linux 2 : unbound, --advisory ALAS2UNBOUND-1.17-2026-009 (ALASUNBOUND-1.17-2026-009)

The version of unbound installed on the remote host is prior to 1.17.0-2. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2UNBOUND-1.17-2026-009 advisory. In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field...

Important: unbound

Issue Overview: In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records...

SUSE CVE-2026-44621

With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with 'unwanted-reply-threshold', could eventually be abruptly terminated if the threshold is reached and libunbound needs to call 'libworkeralloccleanup' since the function is absent from the...

SUSE CVE-2026-50251

In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of 0.0.0.0/::0 can short-circuit Unbound, on systems that can direct such traffic, by issuing DNS queries and receiving seemingly unwanted replies...

Linux Distros Unpatched Vulnerability : CVE-2026-50251

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of...

Libunbound applications configured with 'unwanted-reply-threshold' could eventually be abruptly terminated

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AZL-92979 CVE-2026-50251 affecting package unbound for versions less than 1.25.2-1

In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of 0.0.0.0/::0 can short-circuit Unbound, on systems that can direct such traffic, by issuing DNS queries and receiving seemingly unwanted replies...

CVE-2026-50251

In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of 0.0.0.0/::0 can short-circuit Unbound, on systems that can direct such traffic, by issuing DNS queries and receiving seemingly unwanted replies...

ALPINE-CVE-2026-50251

In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled set to any value greater than zero, glue records of 0.0.0.0/::0 can short-circuit Unbound, on systems that can direct such traffic, by issuing DNS queries and receiving seemingly unwanted replies...

CVE-2026-44621

With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with 'unwanted-reply-threshold', could eventually be abruptly terminated if the threshold is reached and libunbound needs to call 'libworkeralloccleanup' since the function is absent from the...