CVE-2025-40907 · cross-distro fix matrix

CVE-2025-40907: FCGI versions 0.44 through 0.82, for Perl, include a vulnerable version of the FastCGI fcgi2 (aka fcgi) library. The included FastCGI library is affected by CVE-2025-23016, causing an integer overflow (and resultant heap-based buffer overflow) via crafted nameLen or valueLen values in data to the

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-40907 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

libfcgi-perl→ fixed in0.79+ds-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfcgi-perl
```

Debian bookworm

Source: Debian Security Tracker

libfcgi-perl→ fixed in0.79+ds-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfcgi-perl
```

Debian trixie

Source: Debian Security Tracker

libfcgi-perl→ fixed in0.79+ds-2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfcgi-perl
```

Are YOU affected by CVE-2025-40907?

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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