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CVE-2026-41637

Medium priority
Needs evaluation

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, client terminated DNS-over-QUIC (DoQ) queries are not accounted properly by Unbound resulting in low-cost inflation of the waiting number of replies for already in-flight...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-40691

Medium priority
Needs evaluation

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-32665

Medium priority
Needs evaluation

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 (stream_id 0 and 4) bypass the per-stream 'quic-size' gate...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-14586

Medium priority
Needs evaluation

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...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-44608

Medium priority

Some fixes available 3 of 4

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Not affected Not affected Not affected
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CVE-2026-44390

Medium priority

Some fixes available 4 of 8

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very large RRsets with...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Fixed Needs evaluation Needs evaluation
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CVE-2026-42960

Medium priority
Fixed

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Fixed Fixed Fixed
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CVE-2026-42959

Medium priority
Fixed

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...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Fixed Fixed Fixed
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CVE-2026-42944

Medium priority
Fixed

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Not affected Not affected Not affected
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CVE-2026-42923

Medium priority

Some fixes available 4 of 8

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the DNSSEC validator where the code path to consult the negative cache for DS records does not take into account the limit on NSEC3 hash calculations...

1 affected package

unbound

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
unbound Fixed Fixed Fixed Needs evaluation Needs evaluation
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