CVE-2025-61770 · cross-distro fix matrix

CVE-2025-61770: Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble followed by a valid boundary, causing si

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

Fix per ecosystem

Each block below is a distro release where CVE-2025-61770 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

ruby-rack→ fixed in2.1.4-3+deb11u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y ruby-rack
```

Debian bookworm

Source: Debian Security Tracker

ruby-rack→ fixed in2.2.20-0+deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y ruby-rack
```

Debian trixie

Source: Debian Security Tracker

ruby-rack→ fixed in3.1.18-1~deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y ruby-rack
```

Are YOU affected by CVE-2025-61770?

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-2025-61770dropped 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.

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