EUVD-2026-80291

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remot...

CVE-2026-81642: Heap-based Buffer Overflow

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remot...

PT-2026-93374

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions prior to 1.26.1 Description A heap buffer overflow exists in the DNSSEC validator. The issue occurs during CNAME synthesis when an upstream response requires the enforcement of a maximum TTL value in the packet...

PT-2026-93373

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions prior to 1.26.1 Description A heap-based buffer overflow exists in the DNSSEC validator of the Unbound DNS resolver. The issue occurs during the preparation of a DNSKEY digest within the ds create dnskey digest...

Linux Distros Unpatched Vulnerability : CVE-2026-81642

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 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code...

NewStart CGSL MAIN 7.02 : unbound Multiple Vulnerabilities (NS-SA-2026-0095)

The remote NewStart CGSL host, running version MAIN 7.02, has unbound packages installed that are affected by multiple vulnerabilities: - NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that...

K000163141: NLnet Labs Unbound vulnerability CVE-2026-42959

Security Advisory Description NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong counter...

K000163139: NLnet Labs Unbound vulnerability CVE-2026-33278

Security Advisory Description NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination pointer. ...

F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000163139)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.5 / 17.5.1.9 / 21.1.0.2. It is, therefore, affected by a vulnerability as referenced in the K000163139 advisory. NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validat...

Unity Linux 20.1070e Security Update: unbound (UTSA-2026-035854)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-035854 advisory. NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the DNSSEC validator where the code path to consult the negative cache for DS records do...

Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to a DOS vulnerability in NLnet Labs Unbound [CVE-2026-42959]

Summary IBM Watson Speech Services Cartridge is vulnerable to a DOS vulnerability in NLnet Labs Unbound, due to a flaw in the DNSSEC validator that can lead to a crash given malicious upstream replies. CVE-2026-42959. NLnet Labs Unbound is used in our service speech utilities. This vulnerability...

K000163001: NLnet Labs Unbound vulnerability CVE-2026-42923

Security Advisory Description NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the DNSSEC validator where the code path to consult the negative cache for DS records does not take into account the limit on NSEC3 hash calculations introduced in 1.19.1. This leads to...

F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000163001)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.5 / 17.5.1.9 / 21.1.0.2. It is, therefore, affected by a vulnerability as referenced in the K000163001 advisory. NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the DNSSEC validator wher...

EulerOS 2.0 SP15 : unbound (EulerOS-SA-2026-2954)

According to the versions of the unbound packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met...

Important: unbound

Issue Overview: NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination pointer. An adversary c...

unbound security update

An update is available for unbound. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list The unbound packages provide a validating, recursive, and caching DNS or DNSS...

RockyLinux 9 : unbound (RLSA-2026:24369)

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:24369 advisory. unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options CVE-2026-42944 unbound: Unbound DNSSEC Validator Denial of Service via...

Important: Red Hat Security Advisory: unbound security update

An update for unbound is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from t...

Amazon Linux 2 : unbound, --advisory ALAS2-2026-3322 (ALAS-2026-3322)

The version of unbound installed on the remote host is prior to 1.7.3-15. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3322 advisory. NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables...

Important: unbound

Issue Overview: NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination pointer. An adversary c...