CVE-2026-81642

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.

References

https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt

Affected packages

Git / github.com/nlnetlabs/unbound

Affected ranges

Type

GIT

Repo

https://github.com/nlnetlabs/unbound

Events

Introduced

Fixed

13b6717f1716810523ffb60f971a6c9c5e8ce127

Database specific

Show details

{
    "cpe":  "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "1.26.1"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

1.*

1.11.0rc1

Other

final-svn-state

release-0.*

release-0.0

release-0.1

release-0.10

release-0.11

release-0.3

release-0.4

release-0.5

release-0.6

release-0.7

release-0.8

release-1.*

release-1.0.1

release-1.1.1

release-1.10.0rc1

release-1.10.0rc2

release-1.11.0

release-1.11.0rc1

release-1.12.0

release-1.12.0rc1

release-1.13.0rc1

release-1.13.0rc2

release-1.13.0rc3

release-1.13.0rc4

release-1.13.1

release-1.13.1rc1

release-1.13.1rc2

release-1.13.2

release-1.13.2rc1

release-1.14.0

release-1.14.0rc1

release-1.15.0

release-1.15.0rc1

release-1.16.0

release-1.16.0rc1

release-1.16.1

release-1.16.1rc1

release-1.16.2

release-1.18.0

release-1.18.0rc1

release-1.19.0

release-1.19.0rc1

release-1.19.3rc1

release-1.20.0

release-1.20.0rc1

release-1.21.0

release-1.21.0rc1

release-1.22.0

release-1.22.0rc1

release-1.23.0rc1

release-1.24.0

release-1.24.0rc1

release-1.25.0

release-1.25.0rc1

release-1.26.0

release-1.26.0rc1

release-1.3.1

release-1.3.2

release-1.3.3

release-1.3.3rc1

release-1.4.0

release-1.4.0rc1

release-1.4.1

release-1.4.11

release-1.4.11rc1

release-1.4.11rc2

release-1.4.11rc3

release-1.4.12rc1

release-1.4.13

release-1.4.13rc1

release-1.4.13rc2

release-1.4.14

release-1.4.14rc1

release-1.4.17

release-1.4.17rc1

release-1.4.18rc1

release-1.4.18rc2

release-1.4.19

release-1.4.19rc1

release-1.4.2

release-1.4.20

release-1.4.22

release-1.4.22rc1

release-1.4.3

release-1.4.4

release-1.4.4rc1

release-1.4.5

release-1.4.5rc1

release-1.4.6

release-1.4.6rc1

release-1.4.7

release-1.4.7rc1

release-1.4.8rc1

release-1.4.9

release-1.4.9rc1

release-1.5.0rc1

release-1.5.1

release-1.5.10

release-1.5.10rc1

release-1.5.1rc1

release-1.5.1rc2

release-1.5.2

release-1.5.2rc1

release-1.5.3rc1

release-1.5.4

release-1.5.4rc1

release-1.5.5

release-1.5.5rc1

release-1.5.6

release-1.5.6rc1

release-1.5.7

release-1.5.8

release-1.5.8rc1

release-1.5.9rc1

release-1.6.0rc1

release-1.6.1rc1

release-1.6.1rc2

release-1.6.1rc3

release-1.6.2rc1

release-1.6.4rc1

release-1.6.4rc2

release-1.6.6rc1

release-1.6.6rc2

release-1.6.7

release-1.6.7rc1

release-1.7.0rc1

release-1.7.0rc2

release-1.7.0rc3

release-1.7.1rc1

release-1.7.2rc1

release-1.7.3rc1

release-1.8.0rc1

release-1.8.1rc1

release-1.8.2rc1

release-1.9.0rc1

release-1.9.1rc1

release-1.9.2

release-1.9.2rc1

release-1.9.2rc2

release-1.9.2rc3

release-1.9.3

release-1.9.3rc1

release-1.9.3rc2

release-1.9.6

release-1.9.6rc1

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-81642.json"

vanir_signatures

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]

vanir_signatures_modified

"2026-09-24T08:06:50Z"