CVE-2026-32665

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC DoQ is enabled, the first two bidirectional streams on a new QUIC connection streamid 0 and 4 bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte...

PT-2026-63373

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.16.2 through 1.25.1 Description An issue exists within the ghost domain names family of attacks where an adversary controlling a ghost zone can extend the ghost domain window for A/AAAA glue records. By sending a...

PT-2026-63388

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.10.0 through 1.25.1 Description A remote client controlling a delegated domain can cause the daemon to crash, leading to a denial of service. This occurs when the serve-expired: yes setting is enabled alongside a...

PT-2026-63383

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions prior to 1.25.2 Description When the unwanted-reply-threshold is enabled and set to a value greater than zero, the software is susceptible to a cache clearing attack. A malicious actor controlling a delegation that...

EulerOS Virtualization 2.10.1 : unbound (EulerOS-SA-2026-2841)

According to the versions of the unbound packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead ...

Amazon Linux 2 : unbound, --advisory ALAS2UNBOUND-1.17-2026-008 (ALASUNBOUND-1.17-2026-008)

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-1.17-2026-008 advisory. NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that...

MiracleLinux 9 : unbound-1.24.2-3.el9_8.1 (AXSA:2026-1303:08)

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1303:08 advisory. unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options CVE-2026-42944 unbound: Unbound DNSSEC Validator Denial of Service...

K000162178: NLnet Labs Unbound vulnerability CVE-2026-40622

Security Advisory Description NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of attacks that could extend the ghost domain window by up to one cached TTL configured value. Similar to other 'ghost domain names' attacks, an...

F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000162178)

The version of F5 Networks BIG-IP installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the K000162178 advisory. NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of...

Alibaba Cloud Linux 3 : 0207: unbound (ALINUX3-SA-2026:0207)

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0207 advisory. Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities: CVE-2026-40622: NLnet Labs Unbound 1.16.2 ...

unbound: Unbound: Cache manipulation via 'ghost domain names' attack

A flaw was found in NLnet Labs Unbound. A remote attacker, by controlling a malicious domain a "ghost zone" and querying a vulnerable Unbound server, could exploit a vulnerability related to "ghost domain names" attacks. This could allow the attacker to overwrite cached Name Server NS records,...

unbound: Unbound: Denial of Service due to excessive resource consumption with large DNS Resource Record Sets

A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending specially crafted DNS responses containing very large Resource Record Sets RRsets that require name compression. This can cause Unbound to spend a significant amount of time processing these responses, leadin...

unbound: Unbound: Denial of Service via excessive EDNS options

A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending queries with an excessive number of EDNS Extension Mechanisms for DNS options. This can cause Unbound threads to be held hostage while parsing and creating internal data structures for these options...

unbound: Unbound: Denial of Service due to excessive resource consumption with large DNS Resource Record Sets

A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending specially crafted DNS responses containing very large Resource Record Sets RRsets that require name compression. This can cause Unbound to spend a significant amount of time processing these responses, leadin...

unbound: Unbound: Cache manipulation via 'ghost domain names' attack

A flaw was found in NLnet Labs Unbound. A remote attacker, by controlling a malicious domain a "ghost zone" and querying a vulnerable Unbound server, could exploit a vulnerability related to "ghost domain names" attacks. This could allow the attacker to overwrite cached Name Server NS records,...

Astra Linux – Vulnerability in unbound

Unbound versions up to and including 1.24.1 are vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers into updating their delegation information for the zone. Typically, these RRSets are use...

Alibaba Cloud Linux 3 : 0156: unbound (ALINUX3-SA-2026:0156)

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0156 advisory. Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities: CVE-2026-42944: NLnet Labs Unbound 1.14.0 ...

RHSA-2026:24369 Red Hat Security Advisory: unbound security update

Bulletin has no description...

CVE-2026-42534

A flaw was found in Unbound. An adversary who can query a vulnerable Unbound instance and control a slow or malicious domain name server can exploit a vulnerability in the jostle logic. This flaw allows retransmitted queries to renew the age of slow-running queries, preventing them from being...

CVE-2026-40622

A flaw was found in NLnet Labs Unbound. A remote attacker, by controlling a malicious domain a "ghost zone" and querying a vulnerable Unbound server, could exploit a vulnerability related to "ghost domain names" attacks. This could allow the attacker to overwrite cached Name Server NS records,...