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CVE-2018-18584 · cross-distro fix matrix

CVE-2018-18584: In mspack/cab.h in libmspack before 0.8alpha and cabextract before 1.8, the CAB block input buffer is one byte too small for the maximal Quantum block, leading to an out-of-bounds write.

Affects 8 Linux releases across 16 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2018-18584 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

cabextract→ fixed in1.4-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y cabextract
```
libmspack→ fixed in0.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libmspack
```

Debian bookworm

Source: Debian Security Tracker

cabextract→ fixed in1.4-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y cabextract
```
libmspack→ fixed in0.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libmspack
```

Debian trixie

Source: Debian Security Tracker

cabextract→ fixed in1.4-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y cabextract
```
libmspack→ fixed in0.8-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libmspack
```

Alpine v3.20

Source: Alpine secdb

cabextract→ fixed in1.8-r0

apk update && apk add --upgrade cabextract

libmspack→ fixed in0.8_alpha-r0

apk update && apk add --upgrade libmspack

Alpine v3.21

Source: Alpine secdb

cabextract→ fixed in1.8-r0

apk update && apk add --upgrade cabextract

libmspack→ fixed in0.8_alpha-r0

apk update && apk add --upgrade libmspack

Alpine edge

Source: Alpine secdb

cabextract→ fixed in1.8-r0

apk update && apk add --upgrade cabextract

libmspack→ fixed in0.8_alpha-r0

apk update && apk add --upgrade libmspack

Alpine v3.18

Source: Alpine secdb

cabextract→ fixed in1.8-r0

apk update && apk add --upgrade cabextract

libmspack→ fixed in0.8_alpha-r0

apk update && apk add --upgrade libmspack

Alpine v3.19

Source: Alpine secdb

cabextract→ fixed in1.8-r0

apk update && apk add --upgrade cabextract

libmspack→ fixed in0.8_alpha-r0

apk update && apk add --upgrade libmspack

Are YOU affected by CVE-2018-18584?

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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Continuous monitoring beats manual checking

CVE-2018-18584dropped 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.

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