CVE-2026-81642
Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY
CVE-2026-81642 is fixed in 17 products on 1 platform, first by libunbound8 1.24.2-1ubuntu2.3, released September 16, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0096
61st percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libunbound2 · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | libunbound2 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| libunbound8 · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | libunbound8 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| libunbound8 · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.16 | libunbound8 1.13.1-1ubuntu5.16 | Oct 6, 2026 |
| libunbound8 · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.10 | libunbound8 1.19.2-1ubuntu3.10 | Oct 6, 2026 |
| libunbound8 · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.3 | libunbound8 1.24.2-1ubuntu2.3 | Sep 16, 2026 |
| python-unbound · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | python-unbound 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| python-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | python-unbound 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| python3-unbound · RHEL 8 | 0:1.16.2-5.14.el8_10.4 | RHSA-2026:70754 | Sep 23, 2026 |
| python3-unbound · RHEL 9 | 0:1.24.2-3.el9_8.8 | RHSA-2026:71487 | Sep 24, 2026 |
| python3-unbound · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | python3-unbound 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| python3-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | python3-unbound 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| python3-unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.16 | python3-unbound 1.13.1-1ubuntu5.16 | Oct 6, 2026 |
| python3-unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.10 | python3-unbound 1.19.2-1ubuntu3.10 | Oct 6, 2026 |
| python3-unbound · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.3 | python3-unbound 1.24.2-1ubuntu2.3 | Sep 16, 2026 |
| python3-unbound · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| python3-unbound · almalinux 8 | 1.16.2-5.14.el8_10.4 | ALSA-2026:70754 | Sep 23, 2026 |
| python3-unbound · almalinux 9 | 1.24.2-3.el9_8.8 | ALSA-2026:71487 | Sep 24, 2026 |
| python3-unbound · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| python3-unbound · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| python3-unbound · ol 8 | 0:1.16.2-5.14.el8_10.4 | ELSA-2026-70754 | Sep 24, 2026 |
| python3-unbound · ol 9 | 0:1.24.2-3.el9_8.8 | ELSA-2026-71487 | Sep 24, 2026 |
| python3-unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound · Debian 13.5 (trixie) | 1.26.1-0+deb13u1 | DEBIAN-CVE-2026-81642 | Sep 19, 2026 |
| unbound · Debian 14 | 1.26.1-1 | DEBIAN-CVE-2026-81642 | Sep 19, 2026 |
| unbound · RHEL 10 | 1.20.0-18.el10_0.13 | RHSA-2026:71459 | Sep 24, 2026 |
| unbound · RHEL 8 | 0:1.16.2-5.14.el8_10.4 | RHSA-2026:70754 | Sep 23, 2026 |
| unbound · RHEL 9 | 0:1.24.2-3.el9_8.8 | RHSA-2026:71487 | Sep 24, 2026 |
| unbound · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | unbound 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | unbound 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.16 | unbound 1.13.1-1ubuntu5.16 | Oct 6, 2026 |
| unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.10 | unbound 1.19.2-1ubuntu3.10 | Oct 6, 2026 |
| unbound · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.3 | unbound 1.24.2-1ubuntu2.3 | Sep 16, 2026 |
| unbound · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound · almalinux 8 | 1.16.2-5.14.el8_10.4 | ALSA-2026:70754 | Sep 23, 2026 |
| unbound · almalinux 9 | 1.24.2-3.el9_8.8 | ALSA-2026:71487 | Sep 24, 2026 |
| unbound · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound · ol 8 | 0:1.16.2-5.14.el8_10.4 | ELSA-2026-70754 | Sep 24, 2026 |
| unbound · ol 9 | 0:1.24.2-3.el9_8.8 | ELSA-2026-71487 | Sep 24, 2026 |
| unbound · opensuse-leap 16.0 | 1.26.1-160000.1.1 | OPENSUSE-SU-2026:22082-1 | Nov 7, 2026 |
| unbound · rocky 10 | 0:1.24.2-7.el10_2.6 | RLSA-2026:71419 | Sep 25, 2026 |
| unbound · rocky 8 | 0:1.16.2-5.14.el8_10.4 | RLSA-2026:70754 | Sep 24, 2026 |
| unbound · rocky 9 | 0:1.24.2-3.el9_8.8 | RLSA-2026:71487 | Sep 25, 2026 |
| unbound · sles 15.6 | 1.26.1-150600.23.24.1 | SUSE-SU-2026:4620-1 | Nov 7, 2026 |
| unbound · sles 15.7 | 1.26.1-150600.23.24.1 | SUSE-SU-2026:4620-1 | Nov 7, 2026 |
| unbound · sles 16.0 | 1.26.1-160000.1.1 | SUSE-SU-2026:24226-1 | Nov 7, 2026 |
| unbound-anchor · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | unbound-anchor 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| unbound-anchor · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | unbound-anchor 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| unbound-anchor · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.16 | unbound-anchor 1.13.1-1ubuntu5.16 | Oct 6, 2026 |
| unbound-anchor · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.10 | unbound-anchor 1.19.2-1ubuntu3.10 | Oct 6, 2026 |
| unbound-anchor · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.3 | unbound-anchor 1.24.2-1ubuntu2.3 | Sep 16, 2026 |
| unbound-anchor · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound-anchor · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-anchor · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound-anchor-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-debugsource · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-devel · RHEL 8 | 0:1.16.2-5.14.el8_10.4 | RHSA-2026:70754 | Sep 23, 2026 |
| unbound-devel · RHEL 9 | 0:1.24.2-3.el9_8.8 | RHSA-2026:71487 | Sep 24, 2026 |
| unbound-devel · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound-devel · almalinux 8 | 1.16.2-5.14.el8_10.4 | ALSA-2026:70754 | Sep 23, 2026 |
| unbound-devel · almalinux 9 | 1.24.2-3.el9_8.8 | ALSA-2026:71487 | Sep 24, 2026 |
| unbound-devel · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-devel · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound-devel · ol 8 | 0:1.16.2-5.14.el8_10.4 | ELSA-2026-70754 | Sep 24, 2026 |
| unbound-devel · ol 9 | 0:1.24.2-3.el9_8.8 | ELSA-2026-71487 | Sep 24, 2026 |
| unbound-dracut · RHEL 9 | 0:1.24.2-3.el9_8.8 | RHSA-2026:71487 | Sep 24, 2026 |
| unbound-dracut · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound-dracut · almalinux 9 | 1.24.2-3.el9_8.8 | ALSA-2026:71487 | Sep 24, 2026 |
| unbound-dracut · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound-dracut · ol 9 | 0:1.24.2-3.el9_8.8 | ELSA-2026-71487 | Sep 24, 2026 |
| unbound-host · Ubuntu 18.04.6 LTS (bionic) | 1.6.7-1ubuntu2.6+esm5 | unbound-host 1.6.7-1ubuntu2.6+esm5 | Oct 6, 2026 |
| unbound-host · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm2 | unbound-host 1.9.4-2ubuntu1.11+esm2 | Oct 6, 2026 |
| unbound-host · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.16 | unbound-host 1.13.1-1ubuntu5.16 | Oct 6, 2026 |
| unbound-host · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.10 | unbound-host 1.19.2-1ubuntu3.10 | Oct 6, 2026 |
| unbound-host · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.3 | unbound-host 1.24.2-1ubuntu2.3 | Sep 16, 2026 |
| unbound-libs · RHEL 8 | 0:1.16.2-5.14.el8_10.4 | RHSA-2026:70754 | Sep 23, 2026 |
| unbound-libs · RHEL 9 | 0:1.24.2-3.el9_8.8 | RHSA-2026:71487 | Sep 24, 2026 |
| unbound-libs · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound-libs · almalinux 8 | 1.16.2-5.14.el8_10.4 | ALSA-2026:70754 | Sep 23, 2026 |
| unbound-libs · almalinux 9 | 1.24.2-3.el9_8.8 | ALSA-2026:71487 | Sep 24, 2026 |
| unbound-libs · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-libs · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound-libs · ol 8 | 0:1.16.2-5.14.el8_10.4 | ELSA-2026-70754 | Sep 24, 2026 |
| unbound-libs · ol 9 | 0:1.24.2-3.el9_8.8 | ELSA-2026-71487 | Sep 24, 2026 |
| unbound-libs-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-utils · almalinux 10 | 1.24.2-7.el10_2.6 | ALSA-2026:71419 | Sep 24, 2026 |
| unbound-utils · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
| unbound-utils · ol 10 | 0:1.24.2-7.el10_2.6 | ELSA-2026-71419 | Sep 24, 2026 |
| unbound-utils-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.14 | ALAS2023-2026-3101 | Sep 17, 2026 |
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