CVE-2026-33636 · cross-distro fix matrix

CVE-2026-33636: LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. In versions 1.6.36 through 1.6.55, an out-of-bounds read and write exists in libpng's ARM/AArch64 Neon-optimized palette expansion path. When expanding 8-bit pa

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

Fix per ecosystem

Each block below is a distro release where CVE-2026-33636 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

libpng1.6→ fixed in1.6.37-3+deb11u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libpng1.6
```

Debian bookworm

Source: Debian Security Tracker

libpng1.6→ fixed in1.6.39-2+deb12u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libpng1.6
```

Debian trixie

Source: Debian Security Tracker

libpng1.6→ fixed in1.6.48-1+deb13u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libpng1.6
```

Alpine v3.20

Source: Alpine secdb

libpng→ fixed in1.6.56-r0
```
apk update && apk add --upgrade libpng
```

Alpine v3.21

Source: Alpine secdb

libpng→ fixed in1.6.56-r0
```
apk update && apk add --upgrade libpng
```

Alpine edge

Source: Alpine secdb

libpng→ fixed in1.6.56-r0
```
apk update && apk add --upgrade libpng
```

Are YOU affected by CVE-2026-33636?

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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