CVE-2019-18886 · cross-distro fix matrix

CVE-2019-18886: An issue was discovered in Symfony 4.2.0 to 4.2.11 and 4.3.0 to 4.3.7. The ability to enumerate users was possible due to different handling depending on whether the user existed when making unauthorized attempts to use the switch users functionality. This is related to symfony/security.

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

Fix per ecosystem

Each block below is a distro release where CVE-2019-18886 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

symfony→ fixed in4.3.8+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y symfony
```

Debian bookworm

Source: Debian Security Tracker

symfony→ fixed in4.3.8+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y symfony
```

Debian trixie

Source: Debian Security Tracker

symfony→ fixed in4.3.8+dfsg-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y symfony
```

Are YOU affected by CVE-2019-18886?

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.

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