CVE-2026-19668

A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

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 is operating properly.

Security Fix(es):

For a secondary zone with transfers restricted by TSIG, named may start to serve the data provided in a zone transfer before the final message with the TSIG signature arrives. This could allow an attacker that does not actually possess a valid TSIG signature to send unauthorized zone contents to a secondary server. Although no TSIG signature ever arrives, named does not rollback to the pre-transfer state. To exploit the vulnerability, the transfer must be a multi-message TCP IXFR, as described by RFC 8945. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-19033)

An attacker may be able to cause a named resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the named resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-19662)

A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-19668)

An inapplicable NSEC record may be accepted by a named resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-19941)

In a query response, an attacker may send named multiple copies of a record that should only exist once (such as an SOA record). If the RDATA is the same on all the copies, the record is appended to the in-memory RDATA set, which can cause increased memory usage of the negative cache and possibly lead to other memory attack vectors. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-75029)

A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.(CVE-2026-77119)

A malformed zone may contain an NS or DNAME node above its origin, which named treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue…

A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

A BIND recursive resolver may experience excessive resource consumption if it encounters large numbers of a particular kind of invalid DNSSEC record. Default limits on "max-records-per-type" and "max-types-per-name" help mitigate the exposure. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

• CVE-2026-19033: require a TSIG on every message of an incoming zone transfer and drop support for sparsely signed transfers
• CVE-2026-19662: keep the owning cache header referenced while a NOQNAME or closest-encloser proof rdataset still points into its data
• CVE-2026-19668: bound the DS-to-DNSKEY matching and RRSIG verification work done while validating a DNSKEY RRset

• SECURITY UPDATE: CPU exhaustion via malformed DNSKEY records
  • debian/patches/CVE-2025-8677.patch: fail validation on invalid DNSKEY in lib/dns/validator.c.
  • CVE-2025-8677
• SECURITY UPDATE: cache poisoning through forged records in answers
  • debian/patches/CVE-2025-40778.patch: tighten resolver caching rules in lib/dns/resolver.c and lib/dns/message.c, and raise the default max-recursion-queries from 32 to 50 in bin/named/config.c.
  • CVE-2025-40778
• SECURITY UPDATE: assertion failure on malformed PRIVATEDNS DNSKEY records
  • debian/patches/CVE-2026-10822.patch: make dns_name_fromwire() honour the active region of the source buffer in lib/dns/name.c.
  • CVE-2026-10822
• SECURITY UPDATE: crash from malformed NSEC/NSEC3 response
  • debian/patches/CVE-2026-13204.patch: treat a missing NOQNAME proof as an error instead of an assertion failure in lib/dns/rbtdb.c, lib/dns/resolver.c and lib/ns/query.c.
  • CVE-2026-13204
• SECURITY UPDATE: forged DNSSEC-validated NXDOMAIN responses
  • debian/patches/CVE-2026-19941.patch: require NSEC wildcard proofs to be signed by the same zone as the NOQNAME proof in lib/dns/validator.c and lib/dns/include/dns/validator.h.
  • CVE-2026-19941
• SECURITY UPDATE: DNSSEC validation bypass via NSEC3 impersonation
  • debian/patches/CVE-2026-10723.patch: check that the NSEC3 signer matches the owning zone in lib/dns/dnssec.c and lib/isc/result.c.
  • CVE-2026-10723
• SECURITY UPDATE: excessive CPU use validating crafted DNSSEC responses
  • debian/patches/CVE-2026-19668.patch: bound the DS-to-DNSKEY matching during DNSSEC validation and make the exhausted quota terminal in lib/dns/validator.c and lib/dns/resolver.c.
  • CVE-2026-19668
• SECURITY UPDATE: use-after-free of cached NOQNAME proofs
  • debian/patches/CVE-2026-19662.patch: keep the cache slabheader that owns a NOQNAME or closest-encloser proof referenced while the proof rdatasets are in use in lib/dns/rbtdb.c.
  • CVE-2026-19662
• SECURITY UPDATE: out-of-zone data above the apex treated as a zone cut
  • debian/patches/CVE-2026-78301.patch: ignore nodes above the zone origin in RBT zone database lookups in lib/dns/rbtdb.c.
  • CVE-2026-78301
• SECURITY UPDATE: sparsely signed incoming zone transfers accepted
  • debian/patches/CVE-2026-19033.patch: require a TSIG on every message of an incoming zone transfer in lib/dns/xfrin.c.
  • CVE-2026-19033
• SECURITY UPDATE: memory amplification via duplicate singleton records
  • debian/patches/CVE-2026-75029.patch: skip duplicate singleton records when parsing DNS messages in lib/dns/message.c.
  • CVE-2026-75029
• SECURITY UPDATE: DNSSEC downgrade of secure delegations via NSEC3 from an unrelated sibling zone
  • debian/patches/CVE-2026-77119.patch: ignore NSEC3 records whose owner zone does not enclose the DS name in the insecure delegation proof in lib/dns/validator.c.
  • CVE-2026-77119
• SECURITY UPDATE: invalid signed wildcard records accepted
  • debian/patches/CVE-2026-11721.patch: reject RRSIG records whose labels field is lower than the signer label count when parsing and verifying in lib/dns/rdata/generic/rrsig_46.c and lib/dns/dnssec.c, and do not sign out-of-zone records in bin/dnssec/dnssec-signzone.c.
  • CVE-2026-11721

Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (CVE-2026-19033). qpcache NOQNAME proof use-after-free crashes recursive resolver (CVE-2026-19662). Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (CVE-2026-19666). Remote assertion failure via 16-bit length truncation in dns_ncache_add() (CVE-2026-19667). Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (CVE-2026-19668). checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (CVE-2026-19941). Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (CVE-2026-75029). named aborts on a TKEY query when the user configuration has no global options statement (CVE-2026-76163). NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (CVE-2026-77119). Unauthenticated remote crash of named via a single DoH SIG(0) request (CVE-2026-77692). Out-of-zone database nodes can become authoritative zone cuts (CVE-2026-78301). Validating resolver can abort while caching a mismatched NOQNAME proof (CVE-2026-80274). SVCB AliasMode additional-data error leaks qpcache references (CVE-2026-81563). Remote CPU denial of service through cached SVCB/HTTPS AliasMode trees (CVE-2026-81736).

These are all security issues fixed in the bind-9.20.29-1.1 package on the GA media of openSUSE Tumbleweed.

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (bsc#1280433).
• CVE-2026-19667: Remote assertion failure via 16-bit length truncation in dns_ncache_add() (bsc#1280435).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-76163: named aborts on a TKEY query when the user configuration has no global options statement (bsc#1280439).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-77692: Unauthenticated remote crash of named via a single DoH SIG(0) request (bsc#1280441).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).
• CVE-2026-80274: Validating resolver can abort while caching a mismatched NOQNAME proof (bsc#1280443).
• CVE-2026-81563: SVCB AliasMode additional-data error leaks qpcache references (bsc#1280444).
• CVE-2026-81736: Remote CPU denial of service through cached SVCB/HTTPS AliasMode trees (bsc#1280445).

Changes for bind:

• Upgrade to release 9.20.29 Feature Changes:

• Reject oversized and malformed DNSKEY records up front.
• Speed up RPZ policy zone updates. Bug Fixes:
• Prevent a crash when using both dns64 and filter-a.
• Stop passing UDP client addresses to update-policy external helpers.
• Missing required NSEC3 for delegation not detected.
• Tighten EUI48 and EUI64 text parsing.
• GeoIP ACL state could be stale or wrong after reload.
• Honor DNSSEC policy key tag ranges.
• Fix a double free in mdig when EDNS options are specified.
• Fix a crash when an IXFR falls back to AXFR with updates still pending.
• Fix DS requests to parental agents over TLS.
• Fix the rndc-confgen -q (quiet) option.
• Enforce query ACLs for redirect zones and searched DLZs.
• Check asnum validity in GeoIP ACLs.
• Fix a crash on remote-servers lists that reference themselves.
• A record from outside a response policy zone could crash named.
• Invalid key-store configuration could abort the DNSSEC tools.
• NSEC signature set could bypass the secure-delegation check.
• Fix a possible nsupdate issue when using GSS-TSIG.
• Fix a crash with a single-element geoip sortlist.
• Prevent out-of-bailiwick CNAMEs from evicting cached records.
• Restore periodic cleanup of stale resolver address data.
• Fix named-checkconf/named crash with malformed key name.
• Prevent resolver crashes while processing DNS over TCP.
• Ensure NSEC authority does not cross zonecut boundary.
• Treat an unusable NSEC3 chain as a verification failure.
• Treat non-canonical RPZ prefixes as any other failure.
• Negative caching stopped working with stale-answer-client-timeout set to 0.
• An unterminated OpenSSL private-key Label: field could be read past its parser buffer.
• Restore SMF support on Solaris and illumos.
• Fix compilation on GNU/Hurd.
• dig +yaml was producing invalid YAML when a lookup failed.
• Properly prevent TSIG generation command line injection attacks.
• Fix a potential heap bounds overflow write in dnssec-signzone.
• Fix crashes on invalid DNSTAP input in dnstap-read.

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (bsc#1280433).
• CVE-2026-19667: Remote assertion failure via 16-bit length truncation in dns_ncache_add() (bsc#1280435).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-76163: named aborts on a TKEY query when the user configuration has no global options statement (bsc#1280439).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-77692: Unauthenticated remote crash of named via a single DoH SIG(0) request (bsc#1280441).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).
• CVE-2026-80274: Validating resolver can abort while caching a mismatched NOQNAME proof (bsc#1280443).
• CVE-2026-81563: SVCB AliasMode additional-data error leaks qpcache references (bsc#1280444).
• CVE-2026-81736: Remote CPU denial of service through cached SVCB/HTTPS AliasMode trees (bsc#1280445).

Changes for bind:

• Upgrade to release 9.20.29 Feature Changes:

• Reject oversized and malformed DNSKEY records up front.
• Speed up RPZ policy zone updates. Bug Fixes:
• Prevent a crash when using both dns64 and filter-a.
• Stop passing UDP client addresses to update-policy external helpers.
• Missing required NSEC3 for delegation not detected.
• Tighten EUI48 and EUI64 text parsing.
• GeoIP ACL state could be stale or wrong after reload.
• Honor DNSSEC policy key tag ranges.
• Fix a double free in mdig when EDNS options are specified.
• Fix a crash when an IXFR falls back to AXFR with updates still pending.
• Fix DS requests to parental agents over TLS.
• Fix the rndc-confgen -q (quiet) option.
• Enforce query ACLs for redirect zones and searched DLZs.
• Check asnum validity in GeoIP ACLs.
• Fix a crash on remote-servers lists that reference themselves.
• A record from outside a response policy zone could crash named.
• Invalid key-store configuration could abort the DNSSEC tools.
• NSEC signature set could bypass the secure-delegation check.
• Fix a possible nsupdate issue when using GSS-TSIG.
• Fix a crash with a single-element geoip sortlist.
• Prevent out-of-bailiwick CNAMEs from evicting cached records.
• Restore periodic cleanup of stale resolver address data.
• Fix named-checkconf/named crash with malformed key name.
• Prevent resolver crashes while processing DNS over TCP.
• Ensure NSEC authority does not cross zonecut boundary.
• Treat an unusable NSEC3 chain as a verification failure.
• Treat non-canonical RPZ prefixes as any other failure.
• Negative caching stopped working with stale-answer-client-timeout set to 0.
• An unterminated OpenSSL private-key Label: field could be read past its parser buffer.
• Restore SMF support on Solaris and illumos.
• Fix compilation on GNU/Hurd.
• dig +yaml was producing invalid YAML when a lookup failed.
• Properly prevent TSIG generation command line injection attacks.
• Fix a potential heap bounds overflow write in dnssec-signzone.
• Fix crashes on invalid DNSTAP input in dnstap-read.

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (bsc#1280433).
• CVE-2026-19667: Remote assertion failure via 16-bit length truncation in dns_ncache_add() (bsc#1280435).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-76163: named aborts on a TKEY query when the user configuration has no global options statement (bsc#1280439).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-77692: Unauthenticated remote crash of named via a single DoH SIG(0) request (bsc#1280441).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).
• CVE-2026-80274: Validating resolver can abort while caching a mismatched NOQNAME proof (bsc#1280443).
• CVE-2026-81563: SVCB AliasMode additional-data error leaks qpcache references (bsc#1280444).
• CVE-2026-81736: Remote CPU denial of service through cached SVCB/HTTPS AliasMode trees (bsc#1280445).

Changes for bind:

Upgrade to release 9.20.29

New Features:

• Disclose active Negative Trust Anchors with Extended DNS Error

Feature Changes:

• Reject oversized and malformed DNSKEY records up front.
• Speed up RPZ policy zone updates. Bug Fixes:
• Prevent a crash when using both dns64 and filter-a.
• Stop passing UDP client addresses to update-policy external helpers.
• Missing required NSEC3 for delegation not detected.
• Tighten EUI48 and EUI64 text parsing.
• GeoIP ACL state could be stale or wrong after reload.
• Honor DNSSEC policy key tag ranges.
• Fix a double free in mdig when EDNS options are specified.
• Fix a crash when an IXFR falls back to AXFR with updates still pending.
• Fix DS requests to parental agents over TLS.
• Fix the rndc-confgen -q (quiet) option.
• Enforce query ACLs for redirect zones and searched DLZs.
• Check asnum validity in GeoIP ACLs.
• Fix a crash on remote-servers lists that reference themselves.
• A record from outside a response policy zone could crash named.
• Invalid key-store configuration could abort the DNSSEC tools.
• NSEC signature set could bypass the secure-delegation check.
• Fix a possible nsupdate issue when using GSS-TSIG.
• Fix a crash with a single-element geoip sortlist.
• Prevent out-of-bailiwick CNAMEs from evicting cached records.
• Restore periodic cleanup of stale resolver address data.
• Fix named-checkconf/named crash with malformed key name.
• Prevent resolver crashes while processing DNS over TCP.
• Ensure NSEC authority does not cross zonecut boundary.
• Treat an unusable NSEC3 chain as a verification failure.
• Treat non-canonical RPZ prefixes as any other failure.
• Negative caching stopped working with stale-answer-client-timeout set to 0.
• An unterminated OpenSSL private-key Label: field could be read past its parser buffer.
• Restore SMF support on Solaris and illumos.
• Fix compilation on GNU/Hurd.
• dig +yaml was producing invalid YAML when a lookup failed.
• Properly prevent TSIG generation command line injection attacks.
• Fix a potential heap bounds overflow write in dnssec-signzone.
• Fix crashes on invalid DNSTAP input in dnstap-read.

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (bsc#1280433).
• CVE-2026-19667: Remote assertion failure via 16-bit length truncation in dns_ncache_add() (bsc#1280435).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).
• CVE-2026-80274: Validating resolver can abort while caching a mismatched NOQNAME proof (bsc#1280443).

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path (bsc#1280433).
• CVE-2026-19667: Remote assertion failure via 16-bit length truncation in dns_ncache_add() (bsc#1280435).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).
• CVE-2026-80274: Validating resolver can abort while caching a mismatched NOQNAME proof (bsc#1280443).

This update for bind fixes the following issues:

• CVE-2026-19033: Unauthenticated IXFR deltas are applied to the live zone before TSIG verification (bsc#1280430).
• CVE-2026-19662: qpcache NOQNAME proof use-after-free crashes recursive resolver (bsc#1280432).
• CVE-2026-19668: Resource Exhaustion via Excessive DNSSEC Cryptographic Material Matching (bsc#1280436).
• CVE-2026-19941: checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof (bsc#1280437).
• CVE-2026-75029: Message parser retains every identical singleton RDATA, enabling wire-to-work amplification (bsc#1280438).
• CVE-2026-77119: NSEC3 insecure-referral proof can use unrelated cached NSEC3 RRsets (bsc#1280440).
• CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts (bsc#1280442).

Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain malformed DNSKEY records. A remote attacker could possibly use this issue to cause Bind to consume resources, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2025-8677)

Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind incorrectly accepted certain records from answers. A remote attacker could possibly use this issue to perform a cache poisoning attack. This issue only affected Ubuntu 18.04 LTS. (CVE-2025-40778)

Samy Medjahed discovered that Bind incorrectly handled insecure delegation validation. A remote attacker could possibly use this issue to cause excessive NSEC3 iterations, consuming CPU resources, and leading to a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-1519)

It was discovered that Bind incorrectly accepted NSEC3 records whose signer name did not match the owning zone. A remote attacker could possibly use this issue to perform NSEC3 impersonation attacks, bypassing DNSSEC validation. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-10723)

It was discovered that Bind incorrectly handled Key Records using the PRIVATEDNS algorithm. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-10822)

It was discovered that Bind incorrectly handled wildcard CNAME expansion in Response Policy Zones. A remote attacker could possibly use this issue to bypass configured RPZ policies. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-11331)

It was discovered that Bind incorrectly tracked memory usage in the DNS cache. A remote attacker could possibly use this issue to cause Bind to use memory beyond configured limits, leading to a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-11622)

It was discovered that Bind incorrectly handled signed wildcard records with label count discrepancies and RRSIG validation. A remote attacker could possibly use this issue to perform cache poisoning attacks. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-11721)

It was discovered that Bind incorrectly handled DNSSEC validation when a domain was covered by both NSEC and NSEC3 records with only one type having an RRSIG. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-13204)

It was discovered that Bind incorrectly validated out-of-zone NSEC next owner names during DNSSEC validation. A remote attacker could possibly use this issue to bypass DNSSEC validation. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-13321)

It was discovered that Bind incorrectly served zone transfer data before verifying the TSIG signature on multi-message transfers. A remote attacker could possibly use this issue to send unauthorized zone contents to a secondary server. (CVE-2026-19033)

It was discovered that Bind incorrectly handled the lifetime of cached DNSSEC proofs, leading to a use-after-free. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-19662)

It was discovered that Bind incorrectly handled certain malformed answers when configured to use DNS64. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. (CVE-2026-19666)

It was discovered that Bind incorrectly handled oversized negative answers when storing them in the…

It was discovered that Bind incorrectly handled certain DNS messages with repeated singleton records such as SOA, CNAME, or DNAME records. A remote attacker could possibly use this issue to cause Bind to use excessive memory, leading to a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-75029)

It was discovered that Bind incorrectly handled cached DNSSEC proofs. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-19662)

It was discovered that Bind incorrectly handled certain invalid DNSSEC records. A remote attacker could possibly use this issue to cause Bind to use excessive CPU resources, leading to a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-19668)

It was discovered that Bind incorrectly handled malformed answers on resolvers configured to use DNS64. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-19666)

It was discovered that Bind incorrectly handled TKEY queries when no global options block was present. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-76163)

It was discovered that Bind incorrectly verified TSIG signatures during zone transfers. A remote attacker could possibly use this issue to inject unauthorized zone contents into a secondary server. This issue only affected Ubuntu 26.10. (CVE-2026-19033)

It was discovered that Bind incorrectly handled certain NSEC wildcard proofs. A remote attacker could possibly use this issue to forge NXDOMAIN responses and hide the existence of wildcard records. This issue only affected Ubuntu 26.10. (CVE-2026-19941)

It was discovered that Bind incorrectly handled DNS-over-HTTPS requests with invalid SIG(0) records. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-77692)

It was discovered that Bind incorrectly handled malformed zones containing NS or DNAME nodes above the zone origin. An attacker could possibly use this issue to cause Bind to serve out-of-zone records as authoritative, leading to cache poisoning. This issue only affected Ubuntu 26.10. (CVE-2026-78301)

It was discovered that Bind incorrectly handled SVCB/HTTPS AliasMode records referencing large numbers of ServiceMode records. A remote attacker could possibly use this issue to cause Bind to exhaust resources, leading to a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-81563)

It was discovered that Bind incorrectly validated NSEC3 records from unrelated sibling zones. A remote attacker could possibly use this issue to perform a DNSSEC downgrade attack and have forged unsigned answers accepted. This issue only affected Ubuntu 26.10. (CVE-2026-77119)

It was discovered that Bind incorrectly handled wildcard answers with mixed NSEC and NSEC3 proofs. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-80274)

It was discovered that Bind incorrectly handled oversized negative cache records. A remote attacker could possibly use this issue to cause Bind to crash, resulting in a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-19667)

It was discovered that Bind incorrectly handled cached trees of SVCB/HTTPS AliasMode records. A remote attacker could possibly use this issue to cause Bind to use excessive CPU resources, leading to a denial of service. This issue only affected Ubuntu 26.10. (CVE-2026-81736)

It was discovered that Bind incorrectly limited the processing of compression pointers in inbound DNS messages. A remote attacker could possibly use this issue to cause Bind to use excessive CPU and memory…