Debian: libpng Critical DoS Update DLA-4396-1 CVE-2025-64505

CVE-2025-64505

Heap buffer over-read in png_do_quantize via malformed palette index.

CVE-2025-64506

Heap buffer over-read in png_write_image_8bit

CVE-2025-64720

Buffer overflow in png_image_read_composite via incorrect palette
premultiplication

CVE-2025-65018

Heap buffer overflow in png_combine_row triggered via
png_image_finish_read

CVE-2025-66293

An out-of-bounds read vulnerability in libpng's simplified API allows
reading up to 1012 bytes beyond the png_sRGB_base[512] array when
processing palette PNG images with partial transparency and gamma
correction

For Debian 11 bullseye, these problems have been fixed in version
1.6.37-3+deb11u1.

We recommend that you upgrade your libpng1.6 packages.

For the detailed security status of libpng1.6 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libpng1.6

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be