CVE-2026-80225
Possible degradation of service from continuous queries on the same TCP/DoT connection
CVE-2026-80225 is fixed in 15 products on 1 platform, first by libunbound8 1.9.4-2ubuntu1.11+esm3, released September 16, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0048
41st percentile
In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of distinct uncached names over the TCP/DoT connection, monopolizes a single worker's entire event loop for as long as its writes stay ahead of the drain.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libunbound8 · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | libunbound8 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| libunbound8 · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.17 | libunbound8 1.13.1-1ubuntu5.17 | Sep 16, 2026 |
| libunbound8 · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.12 | libunbound8 1.19.2-1ubuntu3.12 | Sep 16, 2026 |
| libunbound8 · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.4 | libunbound8 1.24.2-1ubuntu2.4 | Sep 16, 2026 |
| python-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | python-unbound 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| python3-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | python3-unbound 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| python3-unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.17 | python3-unbound 1.13.1-1ubuntu5.17 | Sep 16, 2026 |
| python3-unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.12 | python3-unbound 1.19.2-1ubuntu3.12 | Sep 16, 2026 |
| python3-unbound · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.4 | python3-unbound 1.24.2-1ubuntu2.4 | Sep 16, 2026 |
| python3-unbound · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| python3-unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound · Debian 13.5 (trixie) | 1.26.1-0+deb13u1 | DEBIAN-CVE-2026-80225 | Sep 19, 2026 |
| unbound · Debian 14 | 1.26.1-1 | DEBIAN-CVE-2026-80225 | Sep 19, 2026 |
| unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | unbound 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.17 | unbound 1.13.1-1ubuntu5.17 | Sep 16, 2026 |
| unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.12 | unbound 1.19.2-1ubuntu3.12 | Sep 16, 2026 |
| unbound · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.4 | unbound 1.24.2-1ubuntu2.4 | Sep 16, 2026 |
| unbound · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound · opensuse-leap 16.0 | 1.26.1-160000.1.1 | OPENSUSE-SU-2026:22082-1 | Nov 7, 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 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | unbound-anchor 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| unbound-anchor · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.17 | unbound-anchor 1.13.1-1ubuntu5.17 | Sep 16, 2026 |
| unbound-anchor · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.12 | unbound-anchor 1.19.2-1ubuntu3.12 | Sep 16, 2026 |
| unbound-anchor · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.4 | unbound-anchor 1.24.2-1ubuntu2.4 | Sep 16, 2026 |
| unbound-anchor · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-anchor-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-debugsource · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-devel · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-host · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.11+esm3 | unbound-host 1.9.4-2ubuntu1.11+esm3 | Sep 16, 2026 |
| unbound-host · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.17 | unbound-host 1.13.1-1ubuntu5.17 | Sep 16, 2026 |
| unbound-host · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.12 | unbound-host 1.19.2-1ubuntu3.12 | Sep 16, 2026 |
| unbound-host · Ubuntu 26.04.1 LTS (resolute) | 1.24.2-1ubuntu2.4 | unbound-host 1.24.2-1ubuntu2.4 | Sep 16, 2026 |
| unbound-libs · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-libs-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-utils · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
| unbound-utils-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.15 | ALAS2023-2026-3127 | Sep 28, 2026 |
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