unbound: Unbound: Denial of Service via terminated DNS-over-QUIC queries

A flaw was found in Unbound, a Domain Name System DNS resolver. A remote attacker can exploit this vulnerability by sending and immediately terminating DNS-over-QUIC DoQ queries. This improper handling of terminated queries can lead to a build-up of pending responses, causing a degradation of...

unbound: NLnet Labs Unbound: Denial of Service via crafted DNS glue records

A flaw was found in Unbound. A remote malicious actor can exploit a vulnerability by controlling a DNS delegation that returns specific glue records. This can cause Unbound to repeatedly clear its DNS caches, leading to a continuous Denial of Service DoS for DNS resolution...

CVE-2026-12617 Record ordering based unexpected exit with CNAME or DNAME

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A...

CVE-2026-12617 Record ordering based unexpected exit with CNAME or DNAME

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A...

CVE-2026-12617

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A...

EUVD-2026-47711

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A...

CVE-2026-11721

CVE-2026-11721 describes a cache-poisoning risk in BIND 9 when an attacker’s DNS zone responds with an RRSIG that contains fewer labels than the zone hosting the RRSIG. This causes named to generate a wildcard name for a zone shorter than the attacker’s, potentially enabling cache poisoning. The ...

EUVD-2026-47709

It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For...

CVE-2026-11721 Cache poisoning possible with label count discrepancy, RRSIG, and wildcards

It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For...

CVE-2026-11721 Cache poisoning possible with label count discrepancy, RRSIG, and wildcards

It is possible for an attacker's zone to respond to a query with an RRSIG that has a smaller number of labels than the zone in which the RRSIG is contained. This causes named to produce a wildcard name for a zone that is shorter than the attacker's zone, which can result in cache poisoning. For...

CVE-2026-11622

A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the...

CVE-2026-11622

A DNSSEC validating resolver that is under a random subdomain attack against a DNSSEC-signed zone can suffer from runaway memory usage. The attacker needs to be able to send queries faster than the resolver can perform validation. The increased memory usage can be orders of magnitude beyond the...

CVE-2026-11605 Unnecessary validation of DNSSEC signed records

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to...

CVE-2026-11605 Unnecessary validation of DNSSEC signed records

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to...

CVE-2026-11605

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to...

CVE-2026-11605

The CVE-2026-11605 entry describes a resource-exhaustion vulnerability in BIND where the DNSSEC validator always revalidates all RRSIG records in an answer, wasting CPU time on superfluous valid signatures. Affected are BIND 9.20.0–9.20.24, 9.21.0–9.21.23, and 9.20.9-S1–9.20.24-S1. The impact is ...

CVE-2026-11331

CVE-2026-11331 affects BIND 9 with RPZ wildcards (CNAME policies). An attacker who can guess/know that a resolver uses RPZ can craft very long query names to cause NAMETOOLONG during RPZ processing, potentially defeating the RPZ rule or causing an unexpected exit in BIND 9. Affected versions incl...

CVE-2026-11331

An attacker who knows or guesses that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of...

CVE-2026-11331 Potential wildcard CNAME RPZ policy bypass

An attacker who knows or guesses that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of...

CVE-2026-10822

If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid data, and may subsequently abort and exit. BIND will first need to store a DNS record for a key KEY, DNSKEY, etc.. That key must specify a PRIVATEDNS algorithm 253, and in the algorithm identifier,...