CVE-2026-5958 · cross-distro fix matrix

CVE-2026-5958: Michał Majchrowicz and Marcin Wyczechowski discovered that sed incorrectly

Affects 4 Linux releases across 4 (distro × package) combinations. First disclosed: 2026-05-04.

Fix per ecosystem

Each block below is a distro release where CVE-2026-5958 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

sed→ fixed in4.8-1ubuntu2.1USN-8229-1

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

Ubuntu noble

Source: Ubuntu USN

sed→ fixed in4.9-2ubuntu0.24.04.1USN-8229-1
```
sudo apt-get install --only-upgrade -y sed
```

Ubuntu questing

Source: Ubuntu USN

sed→ fixed in4.9-2ubuntu0.25.10.1USN-8229-1
```
sudo apt-get install --only-upgrade -y sed
```

Ubuntu resolute

Source: Ubuntu USN

sed→ fixed in4.9-2ubuntu1USN-8229-1

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

Are YOU affected by CVE-2026-5958?

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

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Continuous monitoring beats manual checking

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