CVE-2025-3891 · cross-distro fix matrix

CVE-2025-3891: A flaw was found in the mod_auth_openidc module for Apache httpd. This flaw allows a remote, unauthenticated attacker to trigger a denial of service by sending an empty POST request when the OIDCPreservePost directive is enabled. The server crashes consistently, affecting availability.

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

Fix per ecosystem

Each block below is a distro release where CVE-2025-3891 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

libapache2-mod-auth-openidc→ fixed in2.4.9.4-0+deb11u6urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libapache2-mod-auth-openidc
```

Debian bookworm

Source: Debian Security Tracker

libapache2-mod-auth-openidc→ fixed in2.4.12.3-2+deb12u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libapache2-mod-auth-openidc
```

Debian trixie

Source: Debian Security Tracker

libapache2-mod-auth-openidc→ fixed in2.4.14.2-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libapache2-mod-auth-openidc
```

Are YOU affected by CVE-2025-3891?

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

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