CVE-2026-42581 · cross-distro fix matrix

CVE-2026-42581: It was discovered that Netty's HTTP proxy handler did not properly

Affects 7 Linux releases across 16 (distro × package) combinations. First disclosed: 2026-05-13.

CVSS v3:MEDIUM · 5.8(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-42581 has a known fix. Run the listed command on that distro to remediate.

Ubuntu bionic

Source: Ubuntu USN

netty→ fixed in1:4.1.7-4ubuntu0.1+esm6USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:4.1.7-4ubuntu0.1+esm6USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu focal

Source: Ubuntu USN

netty→ fixed in1:4.1.45-1ubuntu0.1~esm6USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:4.1.45-1ubuntu0.1~esm6USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu jammy

Source: Ubuntu USN

netty→ fixed in1:4.1.48-4+deb11u2ubuntu0.1+esm3USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:4.1.48-4+deb11u2ubuntu0.1+esm3USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu noble

Source: Ubuntu USN

netty→ fixed in1:4.1.48-9ubuntu0.1+esm3USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:4.1.48-9ubuntu0.1+esm3USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu resolute

Source: Ubuntu USN

netty→ fixed in1:4.1.48-16ubuntu0.1~esm2USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-buffer-java→ fixed in1:4.1.48-16ubuntu0.1~esm2USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-buffer-java
```
libnetty-common-java→ fixed in1:4.1.48-16ubuntu0.1~esm2USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-common-java
```
libnetty-java→ fixed in1:4.1.48-16ubuntu0.1~esm2USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu trusty

Source: Ubuntu USN

netty→ fixed in1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Ubuntu xenial

Source: Ubuntu USN

netty→ fixed in1:4.0.34-1ubuntu0.1~esm4USN-8401-1
```
sudo apt-get install --only-upgrade -y netty
```
libnetty-java→ fixed in1:4.0.34-1ubuntu0.1~esm4USN-8401-1
```
sudo apt-get install --only-upgrade -y libnetty-java
```

Are YOU affected by CVE-2026-42581?

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

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