EUVD-2026-47663

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC DoQ is enabled, the first two bidirectional streams on a new QUIC connection streamid 0 and 4 bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte...

CVE-2026-32665

Unbound 1.22.0–1.25.1 with downstream DNS-over-QUIC enabled is vulnerable. The first two QUIC streams on a new connection (streams 0 and 4) bypass the per-stream quic-size gate, causing large input buffers to be allocated after only the 2-byte length prefix. A remote attacker can force Unbound to...

CVE-2026-32665

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC DoQ is enabled, the first two bidirectional streams on a new QUIC connection streamid 0 and 4 bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte...

CVE-2026-32665 Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC DoQ is enabled, the first two bidirectional streams on a new QUIC connection streamid 0 and 4 bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte...

CVE-2026-32665

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC DoQ is enabled, the first two bidirectional streams on a new QUIC connection streamid 0 and 4 bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte...

CVE-2026-14586

CVE-2026-14586 affects NLnet Labs Unbound 1.22.0–1.25.1 in DNS-over-QUIC (DoQ) environments under high concurrency. The root cause is an assertion in libngtcp2 related to monotonic timestamps; Unbound used realtime, which can trigger an assertion in libngtcp2 for the QUIC timestamp, potentially t...

CVE-2026-14586 Assertion in libngtcp2 when under pressure in high concurrency DNS-over-QUIC environments

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for...

CVE-2026-14586

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for...

EUVD-2026-47662

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, in DNS-over-QUIC environments, with high concurrency and under pressure, an assertion in libngtcp2 about monotonic timestamps could trigger and result in server termination and thus denial of service. When interfacing with libngtcp2, for...

PT-2026-63371

Name of the Vulnerable Software and Affected Versions Unbound versions 1.9.0 through 1.25.1 Description A heap-based buffer overflow occurs when a DNSCrypt query is received over TCP. The routine responsible for encrypting the reply in place does not bound the reply length against the destination...

PT-2026-63382

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.7.0 through 1.25.1 Description An issue exists where an auth/rpz zone with a configured primary hostname that resolves to BOGUS A/AAAA records is still treated as a potential XFR endpoint. XFR Zone Transfer is a...

PT-2026-63367

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.22.0 through 1.25.1 Description In DNS-over-QUIC DoQ environments, high concurrency and system pressure can trigger an assertion in the libngtcp2 library regarding monotonic timestamps. This occurs because Unbound...

PT-2026-63392

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions prior to 1.25.2 Description A heap buffer overflow occurs when the validator builds the canonical RDATA form for an RRSIG-covered PX, RP, MINFO, or SOA RRset. The system computes the address of the second embedded...

PT-2026-63379

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.22.0 through 1.25.1 Description A client query for a deeply nested name under a DNSSEC-signed parent allows the system to send more upstream packets per query than the max-global-quota configuration allows. This...

PT-2026-63370

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.22.0 through 1.25.1 Description A memory-accounting bypass exists in the downstream DNS-over-QUIC DoQ implementation. When DoQ is enabled, the first two bidirectional streams on a new QUIC connection stream id 0 a...

PT-2026-63380

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.15.0 through 1.25.1 Description A use-after-free issue exists in the handling of DNS-over-TLS DoT forwarded queries. The TLS server name is tied to the lifetime of the serviced query struct but is also referenced ...

unbound -- multiple vulnerabilities

NLnet Labs reports: This release consolidates security fixes for issues reported over a period of time. There are fixes for: CVE-2026-14586: Assertion in libngtcp2 when under pressure in high concurrency DNS-over-QUIC environments. CVE-2026-32665: Remote DNS-over-QUIC denial of service due to...

PT-2026-63381

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.6.2 through 1.25.1 Description When configured with the respip module before the validator, along with a response-ip redirect rule or an RPZ file using an RPZ-IP trigger, the rewriting handler fails to verify the...

PT-2026-63376

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.13.2 through 1.25.1 Description An off-by-one error exists in the harden-below-nxdomain logic, which is enabled by default. This issue occurs when stub or forward zones are located below an intermediate label that...

PT-2026-63387

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.6.0 through 1.25.1 Description The view local data and view local datas commands of unbound-control create a bare local zones tree for a configured named view that initially contains no local data. This process...