unbound: NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain...
CVE-2026-96405 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-96405, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.
NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message results in a lot of CPU usage following them. A malicious actor with recursive-query access and control of an ordinarily delegated authority that serves specially crafted replies can exploit the vulnerability and degrade Unbound's general performance.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python3-unbound · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| python3-unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound · Debian 13.5 (trixie) | 1.26.2-0+deb13u1 | DEBIAN-CVE-2026-96405 | Oct 24, 2026 |
| unbound · Debian 14 | 1.26.2-1 | DEBIAN-CVE-2026-96405 | Oct 24, 2026 |
| unbound · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-anchor · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-anchor-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-debugsource · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-devel · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-libs · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-libs-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-utils · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
| unbound-utils-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.17 | ALAS2023-2026-3313 | Nov 7, 2026 |
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