CVE-2026-35501

NLnet Labs Unbound versions 1.0.1 through 1.26.1 are vulnerable to a DNSSEC validation bypass. When configured with a root trust anchor and a secondary trust-anchor: for an island-of-security zone under an insecure parent, an attacker can provide a forged NSEC reply with the SOA bit cleared. The ...

CVE-2026-35501 Bypass of a configured island trust anchor underneath an insecure parent from an atacker-controlled NSEC record.

When NLnet Labs Unbound 1.0.1 up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malicious actor with a forged NSEC reply with the SOA bit cleared...

F5 Networks BIG-IP : NLnet Labs Unbound vulnerability (K000163141)

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 K000163141 advisory. NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the...

Important: unbound security update

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fixes: unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options CVE-2026-42944 unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in...

CVE-2026-33278

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 can exploit the...

bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator

Processing specially crafted responses coming from DNSSEC-signed zones can lead to uncontrolled CPU usage, leading to a Denial of Service in the DNSSEC-validating resolver side. This vulnerability applies only for systems where DNSSEC validation is enabled...

bind9: KeyTrap - Extreme CPU consumption in DNSSEC validator

Processing specially crafted responses coming from DNSSEC-signed zones can lead to uncontrolled CPU usage, leading to a Denial of Service in the DNSSEC-validating resolver side. This vulnerability applies only for systems where DNSSEC validation is enabled...