CVE-2026-42923

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 degradation of service during the...

CVE-2026-42923

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 degradation of service during the...

CVE-2026-42923

Summary: NLnet Labs Unbound up to and including 1.25.0 has a vulnerability in the DNSSEC validator where the path that consults the negative cache for DS records does not honor the NSEC3 hash calculation limit introduced in 1.19.1. An attacker controlling a DNSSEC-signed zone can sign NSEC3 recor...

CVE-2026-42923 Degradation of service with unbounded NSEC3 hash calculations

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 degradation of service during the...

EUVD-2026-31081

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 degradation of service during the...

CVE-2026-42923 Degradation of service with unbounded NSEC3 hash calculations

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 degradation of service during the...

CVE-2026-42923

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 degradation of service during the...

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...

CVE-2026-33278 Possible arbitrary code execution during DNSSEC validation

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...

NLnet Labs Unbound 安全漏洞

NLnet Labs Unbound is a high-performance DNS resolver open-sourced by NLnet Labs. Versions of NLnet Labs Unbound 1.25.0 and earlier contained security vulnerabilities. These vulnerabilities stemmed from the DNSSEC verifier failing to account for NSEC3 hash calculation restrictions when querying D...

PT-2026-42130

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions prior to 1.25.1 Description A flaw in the DNSSEC validator occurs when the code path used to consult the negative cache for DS records ignores the limit on NSEC3 hash calculations. An attacker controlling a DNSSEC...

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...

Unbound -- Multiple vulnerabilities

NLnet Labs reports: This release consolidates security fixes for issues reported over a period of time. There are fixes for: CVE-2026-33278: Possible remote code execution during DNSSEC validation. CVE-2026-42944: Heap overflow and crash with multiple nsid, cookie, padding EDNS options...

dnsmasq: NSEC bitmap parsing infinite loop

A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap...

CLSA-2026-1779214855 bind: Fix of CVE-2026-1519

CVE-2026-1519: fix unbounded NSEC3 iterations when validating referrals to unsigned delegations...

hickory-proto: NSEC3 closest-encloser proof validation enters unbounded loop on cross-zone responses

The NSEC3 closest-encloser proof validation in hickory-proto's 0.25.0-alpha.3 ... 0.25.2 and hickory-net's 0.26.0-alpha.1 .. 0.26.0 DnssecDnsHandle walks from the QNAME up to the SOA owner name, building a list of candidate encloser names. The iterator used assumes the QNAME is a descendant of th...

PT-2026-38485

The NSEC3 closest-encloser proof validation in hickory-proto's 0.25.0-alpha.3 ... 0.25.2 and hickory-net's 0.26.0-alpha.1 .. 0.26.0 DnssecDnsHandle walks from the QNAME up to the SOA owner name, building a list of candidate encloser names. The iterator used assumes the QNAME is a descendant of th...

RUSTSEC-2026-0118 NSEC3 closest-encloser proof validation enters unbounded loop on cross-zone responses

The NSEC3 closest-encloser proof validation in hickory-proto's DnssecDnsHandle walks from the QNAME up to the SOA owner name, building a list of candidate encloser names. The iterator used assumes the QNAME is a descendant of the SOA owner, terminating only when the current candidate equals the S...

CLSA-2026-1777541752 bind: Fix of CVE-2026-1519

CVE-2026-1519: limit NSEC3 iteration count when proving an insecure delegation so a maliciously crafted DNSSEC zone with a high-iteration NSEC3 record cannot exhaust resolver CPU; treat the answer as insecure above the 150-iteration limit. Backport of bind-9.11.36-16.el810.7 RHSA-2026:8352...

CLSA-2026-1777453021 bind: Fix of CVE-2026-1519

CVE-2026-1519: limit NSEC3 iteration count when proving an insecure delegation so a maliciously crafted DNSSEC zone with a high-iteration NSEC3 record cannot exhaust resolver CPU; treat the answer as insecure above the 150-iteration limit. Backport of bind-9.11.36-16.el810.7 RHSA-2026:8352...