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Уязвимости nsd

За последние 30 дней в nsd опубликовано уязвимостей: 4; в каталоге KEV: 0.

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Уязвимостей: 16

  1. CVE-2026-101341

    Высокий · CVSS 8.7EPSS 0,34%Есть исправление

    Stack overwrite from specially formatted TXT-DATA RDATA field

    Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function pointer which is called directly after parse. Zone files which are written out by NSD itself, such for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).

    nsdОперационные системы
    • Обновитесь до 4.15.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  2. CVE-2026-101339

    Высокий · CVSS 8.7EPSS 0,32%Есть исправление

    Stack overwrite from a specially crafted and formatted HIP RR

    A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).

    nsdОперационные системы
    • Обновитесь до 4.15.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  3. CVE-2026-101338

    Высокий · CVSS 8.7EPSS 0,32%Есть исправление

    Stack overwrite from a specially crafted and formatted SVCB or HTTPS RR

    When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).

    nsdОперационные системы
    • Обновитесь до 4.15.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  4. CVE-2026-101337

    Высокий · CVSS 8.7EPSS 0,32%Есть исправление

    Stack overwrite from specially formatted base64 RDATA field

    When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).

    nsdОперационные системы
    • Обновитесь до 4.15.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  5. CVE-2026-19538

    Высокий · CVSS 8.2EPSS 0,26%Есть исправление

    Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS

    The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open.

    nsdОперационные системы
    • Обновитесь до 4.15.1-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  6. CVE-2026-19401

    Высокий · CVSS 8.2EPSS 0,28%Есть исправление

    Remote UDP DoS by sending multiple DNS Cookie options

    Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.

    nsdОперационные системы
    • Обновитесь до 4.15.1-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  7. CVE-2026-18916

    Средний · CVSS 6.9EPSS 0,28%Есть исправление

    Remote TCP DoS by throttling the TCP receive window

    Any remote client can crash a NSD serve child, by throttling the TCP receive window after a TCP query. By continuously crashing the serve childs, the remote client can denial all TCP service to this NSD instance.

    nsdОперационные системы
    • Обновитесь до 4.15.1-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  8. CVE-2026-18664

    Высокий · CVSS 8.2EPSS 0,26%Есть исправление

    Wrong interpretation of ACL ranges

    When ranges are used for access control (i.e. of the form 1.2.3.4-1.2.3.25), because NSD wrongly compares the IP address with the range on little endian systems, IPs that were meant to be allowed may be denied, and, IPs that were meant to be denied access could be allowed. An IPv4 address is compared with IPv4 ranges as unsigned 32 bit numbers directly with the endianness of the host, but the values to compare are in network byte order (big-endian). With IPv6 addresses the comparison is done in 4 times a unsigned 32 bit number comparison, again with the endianness of the host where all values are actually in network bye order.

    nsdОперационные системы
    • Обновитесь до 4.15.1-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  9. CVE-2026-12490

    Высокий · CVSS 8.2EPSS 0,22%Есть исправление

    Bypass of client certificate verification with transfer over TLS

    When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.

    nsdОперационные системы
    • Обновитесь до 4.14.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  10. CVE-2026-12246

    Высокий · CVSS 7.2EPSS 0,44%Есть исправление

    Out of bounds stack write with crafted APL RR

    NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.

    nsdОперационные системы
    • Обновитесь до 4.14.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  11. CVE-2026-12245

    Высокий · CVSS 8.7EPSS 0,46%Есть исправление

    Denial of DNS over TLS service by any DoT client

    NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.

    nsdОперационные системы
    • Обновитесь до 4.14.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  12. CVE-2026-12244

    Высокий · CVSS 8.7EPSS 0,49%Есть исправление

    Heap overflow and crash with crafted SVCB RR

    If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes

    nsdОперационные системы
    • Обновитесь до 4.14.3-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗

  13. CVE-2020-28935

    Средний · CVSS 5.5EPSS 0,49%Есть исправление

    Local symlink attack in Unbound and NSD

    NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink attack. When writing the PID file, Unbound and NSD create the file if it is not there, or open an existing file for writing. In case the file was already present, they would follow symlinks if the file happened to be a symlink instead of a regular file. An additional chown of the file would then take place after it was written, making the user Unbound/NSD is supposed to run as the new owner of the file. If an attacker has local access to the user Unbound/NSD runs as,

    nsdОперационные системы
    • Обновитесь до 4.3.4-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗Исходное сообщение 3 ↗

  15. CVE-2016-6173

    Высокий · CVSS 7.5EPSS 2,92%Есть исправление

    CVE-2016-6173

    NSD before 4.1.11 allows remote DNS master servers to cause a denial of service (/tmp disk consumption and slave server crash) via a zone transfer with unlimited data.

    nsdОперационные системы
    • Обновитесь до 4.1.11-1
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗Исходное сообщение 3 ↗

  16. CVE-2009-1755

    Без оценкиEPSS 3,16%Есть исправление

    CVE-2009-1755

    Off-by-one error in the packet_read_query_section function in packet.c in nsd 3.2.1, and process_query_section in query.c in nsd 2.3.7, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors that trigger a buffer overflow.

    nsdОперационные системы
    • Обновитесь до 2.3.7-3
    Опубликовано Обновлено
    Исходное сообщение 1 ↗Исходное сообщение 2 ↗Исходное сообщение 3 ↗

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