CVE-2025-67725 · cross-distro fix matrix

CVE-2025-67725: Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a single maliciously crafted HTTP request can block the server's event loop for an extended period, caused by the HTTPHeaders.add method. The function accumulates values using string concatenation whe

Affects 4 Linux releases across 4 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-67725 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

python-tornado→ fixed in6.1.0-1+deb11u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y python-tornado
```

Debian bookworm

Source: Debian Security Tracker

python-tornado→ fixed in6.2.0-3+deb12u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y python-tornado
```

Debian trixie

Source: Debian Security Tracker

python-tornado→ fixed in6.4.2-3+deb13u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y python-tornado
```

Alpine edge

Source: Alpine secdb

py3-tornado→ fixed in6.5.4-r0

apk update && apk add --upgrade py3-tornado

Are YOU affected by CVE-2025-67725?

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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