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CVE-2020-12762 · cross-distro fix matrix

CVE-2020-12762: json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.

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

Fix per ecosystem

Each block below is a distro release where CVE-2020-12762 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

json-c→ fixed in0.13.1+dfsg-8urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y json-c
```
libfastjson→ fixed in0.99.9-1+deb11u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfastjson
```

Debian bookworm

Source: Debian Security Tracker

json-c→ fixed in0.13.1+dfsg-8urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y json-c
```
libfastjson→ fixed in1.2304.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfastjson
```

Debian trixie

Source: Debian Security Tracker

json-c→ fixed in0.13.1+dfsg-8urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y json-c
```
libfastjson→ fixed in1.2304.0-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libfastjson
```

Alpine v3.20

Source: Alpine secdb

json-c→ fixed in0.14-r1
```
apk update && apk add --upgrade json-c
```

libfastjson→ fixed in1.2304.0-r0

apk update && apk add --upgrade libfastjson

Alpine v3.21

Source: Alpine secdb

json-c→ fixed in0.14-r1
```
apk update && apk add --upgrade json-c
```

libfastjson→ fixed in1.2304.0-r0

apk update && apk add --upgrade libfastjson

Alpine edge

Source: Alpine secdb

json-c→ fixed in0.14-r1
```
apk update && apk add --upgrade json-c
```

libfastjson→ fixed in1.2304.0-r0

apk update && apk add --upgrade libfastjson

Alpine v3.18

Source: Alpine secdb

json-c→ fixed in0.14-r1
```
apk update && apk add --upgrade json-c
```

libfastjson→ fixed in1.2304.0-r0

apk update && apk add --upgrade libfastjson

Alpine v3.19

Source: Alpine secdb

json-c→ fixed in0.14-r1
```
apk update && apk add --upgrade json-c
```

libfastjson→ fixed in1.2304.0-r0

apk update && apk add --upgrade libfastjson

Are YOU affected by CVE-2020-12762?

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-2020-12762dropped 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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