CVE-2017-18343 · cross-distro fix matrix

CVE-2017-18343: The debug handler in Symfony before v2.7.33, 2.8.x before v2.8.26, 3.x before v3.2.13, and 3.3.x before v3.3.6 has XSS via an array key during exception pretty printing in ExceptionHandler.php, as demonstrated by a /_debugbar/open?op=get URI. NOTE: the vendor's position is that this is not a vulnera

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

Fix per ecosystem

Each block below is a distro release where CVE-2017-18343 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

symfony→ fixed in3.4.0+dfsg-1urgency: unimportant
```
sudo apt-get install --only-upgrade -y symfony
```

Debian bookworm

Source: Debian Security Tracker

symfony→ fixed in3.4.0+dfsg-1urgency: unimportant
```
sudo apt-get install --only-upgrade -y symfony
```

Debian trixie

Source: Debian Security Tracker

symfony→ fixed in3.4.0+dfsg-1urgency: unimportant
```
sudo apt-get install --only-upgrade -y symfony
```

Are YOU affected by CVE-2017-18343?

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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