CVE-2021-43854 · cross-distro fix matrix

CVE-2021-43854: NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. Versions prior to 3.6.5 are vulnerable to regular expression denial of service (ReDoS) attacks. The vulnerability is present in Punkt

Affects 2 Linux releases across 2 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-43854 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

nltk→ fixed in3.6.7-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nltk
```

Debian trixie

Source: Debian Security Tracker

nltk→ fixed in3.6.7-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y nltk
```

Are YOU affected by CVE-2021-43854?

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

CVE-2021-43854dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)