Isc Bind 9 vulnerabilities

CVE-2026-3119 [MEDIUM] CWE-617 CVE-2026-3119: Under certain conditions, `named` may crash when processing a correctly signed query containing a TK Under certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the `named` configuration. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.2

CVE-2026-19033 [MEDIUM] CWE-349 CVE-2026-19033: For a secondary zone with transfers restricted by TSIG, `named` may start to serve the data provided 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

CVE-2017-3136 [MEDIUM] CWE-617 CVE-2017-3136: A query with a specific set of characteristics could cause a server using DNS64 to encounter an asse A query with a specific set of characteristics could cause a server using DNS64 to encounter an assertion failure and terminate. An attacker could deliberately construct a query, enabling denial-of-service against a server if it was configured to use the DNS64 feature and other preconditions were met. Affects BIND 9.8.0 -> 9.8.8-P1, 9.9.0 -> 9.9.9-P6,

CVE-2023-6516 [HIGH] CWE-770 CVE-2023-6516: To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the res

CVE-2018-5741 [MEDIUM] CWE-863 CVE-2018-5741: To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a z To provide fine-grained controls over the ability to use Dynamic DNS (DDNS) to update records in a zone, BIND 9 provides a feature called update-policy. Various rules can be configured to limit the types of updates that can be performed by a client, depending on the key used when sending the update request. Unfortunately, some rule types were not init

CVE-2019-6476 [HIGH] CWE-617 CVE-2019-6476: A defect in code added to support QNAME minimization can cause named to exit with an assertion failu A defect in code added to support QNAME minimization can cause named to exit with an assertion failure if a forwarder returns a referral rather than resolving the query. This affects BIND versions 9.14.0 up to 9.14.6, and 9.15.0 up to 9.15.4.

CVE-2026-10723 [MEDIUM] CWE-347 CVE-2026-10723: BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge BIND may accept incorrect child-zone NSEC3 records as valid, which could allow an attacker to forge authenticated NXDOMAIN responses. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

CVE-2016-9778 [MEDIUM] CWE-388 CVE-2016-9778: An error in handling certain queries can cause an assertion failure when a server is using the nxdom An error in handling certain queries can cause an assertion failure when a server is using the nxdomain-redirect feature to cover a zone for which it is also providing authoritative service. A vulnerable server could be intentionally stopped by an attacker if it was using a configuration that met the criteria for the vulnerability and if the attacker

CVE-2017-3140 [MEDIUM] CWE-400 CVE-2017-3140: If named is configured to use Response Policy Zones (RPZ) an error processing some rule types can le If named is configured to use Response Policy Zones (RPZ) an error processing some rule types can lead to a condition where BIND will endlessly loop while handling a query. Affects BIND 9.9.10, 9.10.5, 9.11.0->9.11.1, 9.9.10-S1, 9.10.5-S1.

CVE-2017-3138 [MEDIUM] CWE-617 CVE-2017-3138: named contains a feature which allows operators to issue commands to a running server by communicati named contains a feature which allows operators to issue commands to a running server by communicating with the server process over a control channel, using a utility program such as rndc. A regression introduced in a recent feature change has created a situation under which some versions of named can be caused to exit with a REQUIRE assertion failure

CVE-2026-5950 [MEDIUM] CWE-606 CVE-2026-5950: An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.

CVE-2026-5947 [MEDIUM] CWE-362 CVE-2026-5947: Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIN Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the li

CVE-2026-3591 [MEDIUM] CWE-305 CVE-2026-3591: A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fai

CVE-2019-6471 [MEDIUM] CWE-362 CVE-2019-6471: A race condition which may occur when discarding malformed packets can result in BIND exiting due to A race condition which may occur when discarding malformed packets can result in BIND exiting due to a REQUIRE assertion failure in dispatch.c. Versions affected: BIND 9.11.0 -> 9.11.7, 9.12.0 -> 9.12.4-P1, 9.14.0 -> 9.14.2. Also all releases of the BIND 9.13 development branch and version 9.15.0 of the BIND 9.15 development branch and BIND Supported

CVE-2019-6465 [MEDIUM] CWE-732 CVE-2019-6465: Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the Controls for zone transfers may not be properly applied to Dynamically Loadable Zones (DLZs) if the zones are writable Versions affected: BIND 9.9.0 -> 9.10.8-P1, 9.11.0 -> 9.11.5-P2, 9.12.0 -> 9.12.3-P2, and versions 9.9.3-S1 -> 9.11.5-S3 of BIND 9 Supported Preview Edition. Versions 9.13.0 -> 9.13.6 of the 9.13 development branch are also affected. V

CVE-2026-10822 [MEDIUM] CWE-617 CVE-2026-10822: If BIND encounters a particular invalid data structure in a DNS record, it will accept the invalid d 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, improperly give a length longer than the actual i

CVE-2026-19662 [MEDIUM] CWE-416 CVE-2026-19662: An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victi 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 p

CVE-2026-19941 [MEDIUM] CWE-345 CVE-2026-19941: An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, 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 th

CVE-2026-77119 [MEDIUM] CWE-346 CVE-2026-77119: A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgr 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-2026-78301 [MEDIUM] CWE-349 CVE-2026-78301: A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cu 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 rec