CVE-2026-35536 · cross-distro fix matrix

CVE-2026-35536: It was discovered that Tornado incorrectly handled parsing of large

Affects 8 Linux releases across 21 (distro × package) combinations. First disclosed: 2026-04-22.

Fix per ecosystem

Each block below is a distro release where CVE-2026-35536 has a known fix. Run the listed command on that distro to remediate.

Ubuntu bionic

Source: Ubuntu USN

python-tornado→ fixed in4.5.3-1ubuntu0.2+esm3USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado
```
python-tornado-doc→ fixed in4.5.3-1ubuntu0.2+esm3USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado-doc
```
python3-tornado→ fixed in4.5.3-1ubuntu0.2+esm3USN-8198-1
```
sudo apt-get install --only-upgrade -y python3-tornado
```

Ubuntu focal

Source: Ubuntu USN

python-tornado→ fixed in6.0.3+really5.1.1-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado
```
python-tornado-doc→ fixed in6.0.3+really5.1.1-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado-doc
```
python3-tornado→ fixed in6.0.3+really5.1.1-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python3-tornado
```

Ubuntu jammy

Source: Ubuntu USN

python-tornado→ fixed in6.1.0-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado
```
python-tornado-doc→ fixed in6.1.0-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado-doc
```
python3-tornado→ fixed in6.1.0-3ubuntu0.1~esm5USN-8198-1
```
sudo apt-get install --only-upgrade -y python3-tornado
```

Ubuntu noble

Source: Ubuntu USN

python-tornado→ fixed in6.4.0-1ubuntu0.5USN-8198-1

sudo apt-get install --only-upgrade -y python-tornado

python-tornado-doc→ fixed in6.4.0-1ubuntu0.5USN-8198-1

sudo apt-get install --only-upgrade -y python-tornado-doc

python3-tornado→ fixed in6.4.0-1ubuntu0.5USN-8198-1

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

Ubuntu questing

Source: Ubuntu USN

python-tornado→ fixed in6.4.2-3ubuntu0.3USN-8198-1

sudo apt-get install --only-upgrade -y python-tornado

python-tornado-doc→ fixed in6.4.2-3ubuntu0.3USN-8198-1

sudo apt-get install --only-upgrade -y python-tornado-doc

python3-tornado→ fixed in6.4.2-3ubuntu0.3USN-8198-1

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

Ubuntu xenial

Source: Ubuntu USN

python-tornado→ fixed in4.2.1-1ubuntu3.1+esm3USN-8198-1
```
sudo apt-get install --only-upgrade -y python-tornado
```
python3-tornado→ fixed in4.2.1-1ubuntu3.1+esm3USN-8198-1
```
sudo apt-get install --only-upgrade -y python3-tornado
```

Ubuntu resolute

Source: Ubuntu USN

python-tornado→ fixed in6.5.4-0.1ubuntu0.1USN-8198-2
```
sudo apt-get install --only-upgrade -y python-tornado
```
python-tornado-doc→ fixed in6.5.4-0.1ubuntu0.1USN-8198-2
```
sudo apt-get install --only-upgrade -y python-tornado-doc
```
python3-tornado→ fixed in6.5.4-0.1ubuntu0.1USN-8198-2
```
sudo apt-get install --only-upgrade -y python3-tornado
```

Debian bullseye

Source: Debian Security Tracker

python-tornado→ fixed in6.1.0-1+deb11u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y python-tornado
```

Are YOU affected by CVE-2026-35536?

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.

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