CVE-2026-96405
Fixed in a distro release EPSS <1%CVSS 5.3
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.
Products: NLnet Labs unbound
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux 2023 | python3-unbound | 1.17.1-1.amzn2023.0.17 |
| Amazon Linux 2023 | unbound | 1.17.1-1.amzn2023.0.17 |
| Amazon Linux 2023 | unbound-anchor | 1.17.1-1.amzn2023.0.17 |
| Amazon Linux 2023 | unbound-devel | 1.17.1-1.amzn2023.0.17 |
| Amazon Linux 2023 | unbound-libs | 1.17.1-1.amzn2023.0.17 |
| Amazon Linux 2023 | unbound-utils | 1.17.1-1.amzn2023.0.17 |
| Debian 12 | unbound | no fix |
| Debian 13 | unbound | 1.26.2-0+deb13u1 |
| Debian 14 | unbound | 1.26.2-1 |
| Ubuntu 22.04 LTS | unbound | no fix |
| Ubuntu 24.04 LTS | unbound | no fix |
| Ubuntu 26.04 LTS | unbound | no fix |
| Ubuntu 26.10 | unbound | no fix |
| Ubuntu Pro 14.04 LTS | unbound | no fix |
| Ubuntu Pro 16.04 LTS | unbound | no fix |
| Ubuntu Pro 18.04 LTS | unbound | no fix |
| Ubuntu Pro 20.04 LTS | unbound | no fix |
| openSUSE Tumbleweed | unbound | 1.26.2-1.1 |