CVE-2025-46421 · cross-distro fix matrix

CVE-2025-46421: A flaw was found in libsoup. When libsoup clients encounter an HTTP redirect, they mistakenly send the HTTP Authorization header to the new host that the redirection points to. This allows the new host to impersonate the user to the original host that issued the redirect.

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

Fix per ecosystem

Each block below is a distro release where CVE-2025-46421 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

libsoup3→ fixed in3.2.3-0+deb12u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libsoup3
```

Debian trixie

Source: Debian Security Tracker

libsoup3→ fixed in3.6.5-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libsoup3
```

Are YOU affected by CVE-2025-46421?

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-2025-46421dropped 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)