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CVE-2026-42534

Medium priority

Some fixes available 4 of 8

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running...

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-2026-41292

Medium priority
Fixed

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold...

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-2026-40622

Medium priority

Some fixes available 3 of 4

NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of attacks that could extend the ghost domain window by up to one cached TTL configured value. Similar to other...

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-2026-33278

High priority
Fixed

NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and...

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-2026-32792

Medium priority

Some fixes available 4 of 8

NLnet Labs Unbound 1.6.2 up to and including version 1.25.0 has a denial of service vulnerability when compiled with DNSCrypt support ('--enable-dnscrypt'). A bad DNSCrypt query could underflow Unbound's DNSCrypt packet reading...

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-2025-11411

Medium priority

Some fixes available 5 of 9

NLnet Labs Unbound up to and including version 1.24.1 is vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers to update...

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-2025-5994

Medium priority

Some fixes available 5 of 9

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support,...

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-2024-8508

Medium priority
Fixed

NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can...

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
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CVE-2024-43168

Medium priority
Fixed

DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made...

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
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CVE-2024-43167

Medium priority
Fixed

DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made...

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
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