CVE-2019-8955 · cross-distro fix matrix

CVE-2019-8955: In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2019-8955 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

tor→ fixed in0.3.5.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y tor
```

Debian bookworm

Source: Debian Security Tracker

tor→ fixed in0.3.5.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y tor
```

Debian trixie

Source: Debian Security Tracker

tor→ fixed in0.3.5.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y tor
```

Alpine v3.20

Source: Alpine secdb

tor→ fixed in0.3.5.8-r0
```
apk update && apk add --upgrade tor
```

Alpine v3.21

Source: Alpine secdb

tor→ fixed in0.3.5.8-r0
```
apk update && apk add --upgrade tor
```

Alpine edge

Source: Alpine secdb

tor→ fixed in0.3.5.8-r0
```
apk update && apk add --upgrade tor
```

Alpine v3.18

Source: Alpine secdb

tor→ fixed in0.3.5.8-r0
```
apk update && apk add --upgrade tor
```

Alpine v3.19

Source: Alpine secdb

tor→ fixed in0.3.5.8-r0
```
apk update && apk add --upgrade tor
```

Are YOU affected by CVE-2019-8955?

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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