CVE-2021-40633 · cross-distro fix matrix

CVE-2021-40633: A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.

Affects 6 Linux releases across 6 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-40633 has a known fix. Run the listed command on that distro to remediate.

Debian trixie

Source: Debian Security Tracker

giflib→ fixed in5.2.2-1urgency: unimportant

sudo apt-get install --only-upgrade -y giflib

Alpine v3.20

Source: Alpine secdb

giflib→ fixed in5.2.2-r0
```
apk update && apk add --upgrade giflib
```

Alpine v3.21

Source: Alpine secdb

giflib→ fixed in5.2.2-r0
```
apk update && apk add --upgrade giflib
```

Alpine edge

Source: Alpine secdb

giflib→ fixed in5.2.2-r0
```
apk update && apk add --upgrade giflib
```

Alpine v3.18

Source: Alpine secdb

giflib→ fixed in5.2.2-r0
```
apk update && apk add --upgrade giflib
```

Alpine v3.19

Source: Alpine secdb

giflib→ fixed in5.2.2-r0
```
apk update && apk add --upgrade giflib
```

Are YOU affected by CVE-2021-40633?

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

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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