unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages

A flaw was found in Unbound's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is...

CVE-2026-42959

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 to calculate write offsets fo...

CVE-2026-42959

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 to calculate write offsets fo...

CVE-2026-42959

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 to calculate write offsets fo...

Exploit for CVE-2025-40778

CVE-2025-40778 Proof of Concept Educational demonstration of...

OESA-2025-1558 bind security update

BIND Berkeley Internet Name Domain is an implementation of the DNS Domain Name System protocols. BIND includes a DNS server named, which resolves host names to IP addresses; a resolver library routines for applications to use when interfacing with DNS; and tools for verifying that the DNS server ...

OESA-2025-1215 bind security update

BIND Berkeley Internet Name Domain is an implementation of the DNS Domain Name System protocols. BIND includes a DNS server named, which resolves host names to IP addresses; a resolver library routines for applications to use when interfacing with DNS; and tools for verifying that the DNS server ...

OESA-2025-1172 bind security update

BIND Berkeley Internet Name Domain is an implementation of the DNS Domain Name System protocols. BIND includes a DNS server named, which resolves host names to IP addresses; a resolver library routines for applications to use when interfacing with DNS; and tools for verifying that the DNS server ...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...

bind: bind9: Many records in the additional section cause CPU exhaustion

A flaw was found in the bind package where a crafted DNS zone may generate numerous records in the 'Additional' section of the response. This flaw allows an attacker to send a large amount of such queries, which may lead either the authoritative server or an independent resolver to run into an...