CVE-2026-42959 · cross-distro fix matrix

CVE-2026-42959: USN-8282-1 fixed vulnerabilities in Unbound. This update provides the

Affects 8 Linux releases across 50 (distro × package) combinations. First disclosed: 2026-05-20.

CVSS v3:HIGH · 7.5(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-42959 has a known fix. Run the listed command on that distro to remediate.

Ubuntu bionic

Source: Ubuntu USN

unbound→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound
```
libunbound-dev→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound-dev
```
libunbound2→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound2
```
python-unbound→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y python-unbound
```
python3-unbound→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y python3-unbound
```
unbound-anchor→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-anchor
```
unbound-host→ fixed in1.6.7-1ubuntu2.6+esm4USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-host
```

Ubuntu focal

Source: Ubuntu USN

unbound→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound
```
libunbound-dev→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound-dev
```
libunbound8→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound8
```
python-unbound→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y python-unbound
```
python3-unbound→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y python3-unbound
```
unbound-anchor→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-anchor
```
unbound-host→ fixed in1.9.4-2ubuntu1.11+esm1USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-host
```

Ubuntu trusty

Source: Ubuntu USN

unbound→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound
```
libunbound-dev→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound-dev
```
libunbound2→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound2
```
python-unbound→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y python-unbound
```
unbound-anchor→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-anchor
```
unbound-host→ fixed in1.4.22-1ubuntu4.14.04.3+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-host
```

Ubuntu xenial

Source: Ubuntu USN

unbound→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound
```
libunbound-dev→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound-dev
```
libunbound2→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y libunbound2
```
python-unbound→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y python-unbound
```
unbound-anchor→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-anchor
```
unbound-host→ fixed in1.5.8-1ubuntu1.1+esm3USN-8282-2
```
sudo apt-get install --only-upgrade -y unbound-host
```

Ubuntu jammy

Source: Ubuntu USN

unbound→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y unbound
```
libunbound-dev→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y libunbound-dev
```
libunbound8→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y libunbound8
```
python3-unbound→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y python3-unbound
```
unbound-anchor→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y unbound-anchor
```
unbound-host→ fixed in1.13.1-1ubuntu5.15USN-8282-1
```
sudo apt-get install --only-upgrade -y unbound-host
```

Ubuntu noble

Source: Ubuntu USN

unbound→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y unbound

libunbound-dev→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y libunbound-dev

libunbound8→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y libunbound8

python3-unbound→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y python3-unbound

unbound-anchor→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y unbound-anchor

unbound-host→ fixed in1.19.2-1ubuntu3.8USN-8282-1

sudo apt-get install --only-upgrade -y unbound-host

Ubuntu questing

Source: Ubuntu USN

unbound→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y unbound

libunbound-dev→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y libunbound-dev

libunbound8→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y libunbound8

python3-unbound→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y python3-unbound

unbound-anchor→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y unbound-anchor

unbound-host→ fixed in1.22.0-2ubuntu2.3USN-8282-1

sudo apt-get install --only-upgrade -y unbound-host

Ubuntu resolute

Source: Ubuntu USN

unbound→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y unbound

libunbound-dev→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y libunbound-dev

libunbound8→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y libunbound8

python3-unbound→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y python3-unbound

unbound-anchor→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y unbound-anchor

unbound-host→ fixed in1.24.2-1ubuntu2.1USN-8282-1

sudo apt-get install --only-upgrade -y unbound-host

Are YOU affected by CVE-2026-42959?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

CVE-2026-42959dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)