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Vulnerabilities / CVE-2026-81642

critical

CVE-2026-81642

unbound: Unbound: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY

Published Modified CWE 122
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, Red Hat, AlmaLinux, Amazon, Oracle, Photon OS, Rocky Linux. Rated lower by Azure Linux (high), Ubuntu (medium).

Description

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.

Affected packages and fixed versions

SourcePackageFixed in
alma 10python3-unbound, unbound, unbound-anchor and 4 more1.24.2-7.el10_2.6
alma 8python3-unbound, unbound, unbound-devel and 1 more1.16.2-5.14.el8_10.4
alma 9python3-unbound, unbound, unbound-devel and 2 more1.24.2-3.el9_8.8
amazon linux 2python2-unbound, python3-unbound, unbound and 3 more1.7.3-15.amzn2.0.16
amazon linux 2023python3-unbound, python3-unbound-debuginfo, unbound and 9 more1.17.1-1.amzn2023.0.14
Oracle Linux 7unbound, unbound-devel, unbound-libs and 1 more1.6.6-5.0.3.el7_8
Oracle Linux 8python3-unbound, unbound, unbound-devel and 1 more1.16.2-5.14.el8_10.4
Oracle Linux 9python3-unbound, unbound, unbound-devel and 2 more1.24.2-3.el9_8.8
Photon OS 5.0unbound, unbound-devel, unbound-docs1.26.1-1.ph5
Red Hatunbound, unbound-devel, unbound-libs and 1 moreno fix listed
rocky 10python3-unbound, unbound, unbound-anchor and 3 more1.24.2-7.el10_2.6
rocky 8python3-unbound, unbound, unbound-devel and 1 more1.16.2-5.14.el8_10.4
Show all 152 entries from 47 sources
SourcePackageFixed in
alma 10python3-unbound1.24.2-7.el10_2.6
alma 10unbound1.24.2-7.el10_2.6
alma 10unbound-anchor1.24.2-7.el10_2.6
alma 10unbound-devel1.24.2-7.el10_2.6
alma 10unbound-dracut1.24.2-7.el10_2.6
alma 10unbound-libs1.24.2-7.el10_2.6
alma 10unbound-utils1.24.2-7.el10_2.6
alma 8python3-unbound1.16.2-5.14.el8_10.4
alma 8unbound1.16.2-5.14.el8_10.4
alma 8unbound-devel1.16.2-5.14.el8_10.4
alma 8unbound-libs1.16.2-5.14.el8_10.4
alma 9python3-unbound1.24.2-3.el9_8.8
alma 9unbound1.24.2-3.el9_8.8
alma 9unbound-devel1.24.2-3.el9_8.8
alma 9unbound-dracut1.24.2-3.el9_8.8
alma 9unbound-libs1.24.2-3.el9_8.8
amazon linux 2python2-unbound1.7.3-15.amzn2.0.16
amazon linux 2python3-unbound1.7.3-15.amzn2.0.16
amazon linux 2unbound1.7.3-15.amzn2.0.16
amazon linux 2unbound-debuginfo1.7.3-15.amzn2.0.16
amazon linux 2unbound-devel1.7.3-15.amzn2.0.16
amazon linux 2unbound-libs1.7.3-15.amzn2.0.16
amazon linux 2023python3-unbound1.17.1-1.amzn2023.0.14
amazon linux 2023python3-unbound-debuginfo1.17.1-1.amzn2023.0.14
amazon linux 2023unbound1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-anchor1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-anchor-debuginfo1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-debuginfo1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-debugsource1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-devel1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-libs1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-libs-debuginfo1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-utils1.17.1-1.amzn2023.0.14
amazon linux 2023unbound-utils-debuginfo1.17.1-1.amzn2023.0.14
Oracle Linux 7unbound1.6.6-5.0.3.el7_8
Oracle Linux 7unbound-devel1.6.6-5.0.3.el7_8
Oracle Linux 7unbound-libs1.6.6-5.0.3.el7_8
Oracle Linux 7unbound-python1.6.6-5.0.3.el7_8
Oracle Linux 8python3-unbound1.16.2-5.14.el8_10.4
Oracle Linux 8unbound1.16.2-5.14.el8_10.4
Oracle Linux 8unbound-devel1.16.2-5.14.el8_10.4
Oracle Linux 8unbound-libs1.16.2-5.14.el8_10.4
Oracle Linux 9python3-unbound1.24.2-3.el9_8.8
Oracle Linux 9unbound1.24.2-3.el9_8.8
Oracle Linux 9unbound-devel1.24.2-3.el9_8.8
Oracle Linux 9unbound-dracut1.24.2-3.el9_8.8
Oracle Linux 9unbound-libs1.24.2-3.el9_8.8
Photon OS 5.0unbound1.26.1-1.ph5
Photon OS 5.0unbound-devel1.26.1-1.ph5
Photon OS 5.0unbound-docs1.26.1-1.ph5
Red Hatunboundno fix listed
Red Hatunbound-develno fix listed
Red Hatunbound-libsno fix listed
Red Hatunbound-pythonno fix listed
rocky 10python3-unbound1.24.2-7.el10_2.6
rocky 10unbound1.24.2-7.el10_2.6
rocky 10unbound-anchor1.24.2-7.el10_2.6
rocky 10unbound-dracut1.24.2-7.el10_2.6
rocky 10unbound-libs1.24.2-7.el10_2.6
rocky 10unbound-utils1.24.2-7.el10_2.6
rocky 8python3-unbound1.16.2-5.14.el8_10.4
rocky 8unbound1.16.2-5.14.el8_10.4
rocky 8unbound-devel1.16.2-5.14.el8_10.4
rocky 8unbound-libs1.16.2-5.14.el8_10.4
rocky 9python3-unbound1.24.2-3.el9_8.8
rocky 9unbound1.24.2-3.el9_8.8
rocky 9unbound-dracut1.24.2-3.el9_8.8
rocky 9unbound-libs1.24.2-3.el9_8.8
alpine 3.22unbound1.25.2-r0
alpine 3.23unbound1.25.2-r0
alpine 3.24unbound1.25.2-r2
alpine edgeunbound1.26.1-r0
Azure Linux 3.0unbound0:1.26.1-1.azl3
debian 11unboundno fix listed
debian 12unboundno fix listed
debian 13unbound1.26.1-0+deb13u1
debian 14unbound1.26.1-1
echounbound1.26.1
rapidfort alma 10python3-unbound1.24.2-7.el10_2.6
rapidfort alma 10unbound0:1.24.2-7.el10_2.6
rapidfort alma 10unbound-anchor0:1.24.2-7.el10_2.6
rapidfort alma 10unbound-devel1.24.2-7.el10_2.6
rapidfort alma 10unbound-dracut1.24.2-7.el10_2.6
rapidfort alma 10unbound-libs0:1.24.2-7.el10_2.6
rapidfort alma 10unbound-utils1.24.2-7.el10_2.6
rapidfort alma 9python3-unbound1.24.2-3.el9_8.8
rapidfort alma 9unbound0:1.24.2-3.el9_8.8
rapidfort alma 9unbound-dracut1.24.2-3.el9_8.8
rapidfort alma 9unbound-libs0:1.24.2-3.el9_8.8
rapidfort alpine 3.20unbound1.25.2-r0
rapidfort alpine 3.21unbound1.25.2-r0
rapidfort alpine 3.22unbound1.25.2-r0
rapidfort alpine 3.23unbound1.25.2-r0
rapidfort alpine 3.24unbound1.25.2-r2
rapidfort amazon linux 2023python3-unbound1.17.1-1.amzn2023.0.14
rapidfort amazon linux 2023unbound0:1.17.1-1.amzn2023.0.14
rapidfort amazon linux 2023unbound-anchor0:1.17.1-1.amzn2023.0.14
rapidfort amazon linux 2023unbound-devel1.17.1-1.amzn2023.0.14
rapidfort amazon linux 2023unbound-libs0:1.17.1-1.amzn2023.0.14
rapidfort amazon linux 2023unbound-utils1.17.1-1.amzn2023.0.14
rapidfort debian 12rf-unbound0:1.26.1-0+deb13u1, 0:1.26.1-1
rapidfort debian 12unbound0:1.26.1-0+deb13u1, 0:1.26.1-1
rapidfort debian 13rf-unbound0:1.26.1-0+deb13u1, 0:1.26.1-1
rapidfort debian 13unbound0:1.26.1-0+deb13u1, 0:1.26.1-1
rapidfort fedora 41rf-unbound0:1.24.1-2.fc41
rapidfort fedora 41rf-unbound-anchor0:1.24.1-2.fc41
rapidfort fedora 41rf-unbound-libs0:1.24.1-2.fc41
rapidfort fedora 41unbound0:1.24.1-2.fc41
rapidfort fedora 41unbound-anchor0:1.24.1-2.fc41
rapidfort fedora 41unbound-libs0:1.24.1-2.fc41
rapidfort fedora 43python3-unbound1.26.1-1.fc43
rapidfort fedora 43rf-unbound0:1.26.1-1.fc43
rapidfort fedora 43rf-unbound-anchor0:1.26.1-1.fc43
rapidfort fedora 43rf-unbound-libs0:1.26.1-1.fc43
rapidfort fedora 43unbound0:1.26.1-1.fc43
rapidfort fedora 43unbound-anchor0:1.26.1-1.fc43
rapidfort fedora 43unbound-devel1.26.1-1.fc43
rapidfort fedora 43unbound-dracut1.26.1-1.fc43
rapidfort fedora 43unbound-libs0:1.26.1-1.fc43
rapidfort fedora 43unbound-munin1.26.1-1.fc43
rapidfort fedora 43unbound-utils1.26.1-1.fc43
rapidfort Oracle Linux 10python3-unbound0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound-anchor0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound-devel0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound-dracut0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound-libs0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 10unbound-utils0:1.24.2-7.el10_2.6
rapidfort Oracle Linux 9python3-unbound0:1.24.2-3.el9_8.8
rapidfort Oracle Linux 9unbound0:1.24.2-3.el9_8.8
rapidfort Oracle Linux 9unbound-devel0:1.24.2-3.el9_8.8
rapidfort Oracle Linux 9unbound-dracut0:1.24.2-3.el9_8.8
rapidfort Oracle Linux 9unbound-libs0:1.24.2-3.el9_8.8
rapidfort rocky 9python3-unbound0:1.24.2-3.el9_8.8
rapidfort rocky 9rf-unbound0:1.24.2-3.el9_8.8
rapidfort rocky 9rf-unbound-libs0:1.24.2-3.el9_8.8
rapidfort rocky 9unbound0:1.24.2-3.el9_8.8
rapidfort rocky 9unbound-dracut0:1.24.2-3.el9_8.8
rapidfort rocky 9unbound-libs0:1.24.2-3.el9_8.8
rapidfort ubuntu 20.04rf-unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
rapidfort ubuntu 20.04unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
rapidfort ubuntu 22.04rf-unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
rapidfort ubuntu 22.04unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
rapidfort ubuntu 24.04rf-unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
rapidfort ubuntu 24.04unbound0:1.13.1-1ubuntu5.16, 0:1.19.2-1ubuntu3.10, 0:1.24.2-1ubuntu2.3
seal Red Hat 8seal-unbound1.16.2-5.8.el8_10+sp999
seal Red Hat 8unbound1.16.2-5.8.el8_10+sp999
ubuntu 18.04-ESMunbound1.6.7-1ubuntu2.6+esm5
ubuntu 20.04-ESMunbound1.9.4-2ubuntu1.11+esm2
ubuntu 22.04unbound1.13.1-1ubuntu5.16
ubuntu 24.04unbound1.19.2-1ubuntu3.10
ubuntu 26.04unbound1.24.2-1ubuntu2.3

References

All 21 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.