CVE-2026-50045

A vulnerability in Unbound allows a remote attacker to bypass upstream amplification limits by querying a deeply nested name under a DNSSEC-signed parent. This triggers excessive outbound traffic per query, potentially causing a denial of service DoS. Mitigation Restrict recursive DNS access...

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...

EulerOS 2.0 SP11 : unbound (EulerOS-SA-2026-3161)

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 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and...

EulerOS 2.0 SP13 : unbound (EulerOS-SA-2026-3054)

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 up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to...

EulerOS 2.0 SP13 : unbound (EulerOS-SA-2026-3004)

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 up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to...

EulerOS 2.0 SP15 : unbound (EulerOS-SA-2026-2913)

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...

TencentOS Server 4: unbound (TSSA-2026:0786)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0786 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:...

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...

RockyLinux 8 : unbound (RLSA-2023:2771)

The remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2023:2771 advisory. unbound: NRDelegation attack leads to uncontrolled resource consumption Non-Responsive Delegation Attack CVE-2022-3204 Tenable has extracted the preceding...

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...

AlmaLinux 8 : unbound (ALSA-2026:37282)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:37282 advisory. unbound: Unbound: Denial of Service via excessive EDNS options CVE-2026-41292 unbound: Unbound: Cache manipulation via 'ghost domain names' attack...

The vulnerability of the Unbound DNS server, related to improper blocking of resources, allows a hacker to trigger a service failure.

The vulnerability of the Unbound DNS server is related to improper blocking of resources. Exploiting this vulnerability can allow a malicious actor to cause service failures...

The vulnerability of the Unbound DNS server, related to excessive resource consumption during the cycle, allows a hacker to cause a service failure.

The vulnerability of the Unbound DNS server is related to excessive resource consumption during the cycle. Exploiting this vulnerability allows a malicious actor to cause service failures...

K000162456: NLnet Labs Unbound vulnerability CVE-2026-41292 and CVE-2026-42944

Security Advisory Description CVE-2026-41292 NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage whil...

CVE-2026-55991

A flaw was found in Unbound. A remote, unauthenticated client can exploit this vulnerability by sending a specially crafted DNS-over-QUIC DoQ connection and a single DNS query. This can trigger an assertion failure in the libngtcp2 library, leading to the termination of the entire Unbound process...

SUSE CVE-2026-50248

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record no valid RRSIG required becomes the zone'...

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...

SUSE CVE-2026-54478

In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' interface with 'answer-cookie: yes', the RFC 9018 server-cookie SipHash is computed over the proxy's wire address instead of the PROXYv2-declared client. One server cookie obtained through a...

Linux Distros Unpatched Vulnerability : CVE-2026-44621

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - With NLnet Labs Unbound up to and including version 1.25.1, applications using libunbound and configured with 'unwanted-reply-threshold', could eventually be...

Linux Distros Unpatched Vulnerability : CVE-2026-42955

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 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 ...