| Package | libpng1.6 |
|---|---|
| Version | 1.6.28-1+deb9u3 (stretch), 1.6.36-6+deb10u2 (buster) |
| Related CVEs | CVE-2026-22695 CVE-2026-22801 CVE-2026-25646 |
Multiple vulnerabilties have been found in libpng, the official PNG reference library, potentially allowing information disclosure via out-of-bounds read or denial of service via infinite loop.
CVE-2026-22695
There is a heap buffer over-read in the libpng simplified API function png_image_finish_read when processing interlaced 16-bit PNGs with 8-bit output format and non-minimal row stride. This is a regression introduced by the fix for CVE-2025-65018.
CVE-2026-22801
There is an integer truncation in the libpng simplified write API functions png_write_image_16bit and png_write_image_8bit causes heap buffer over-read when the caller provides a negative row stride (for bottom-up image layouts) or a stride exceeding 65535 bytes. The bug was introduced in libpng 1.6.26 (October 2016) by casts added to silence compiler warnings on 16-bit systems.
CVE-2026-25646
A out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification.
For Debian 10 buster, these problems have been fixed in version 1.6.36-6+deb10u2.
For Debian 9 stretch, these problems have been fixed in version 1.6.28-1+deb9u3.
We recommend that you upgrade your libpng1.6 packages.
Further information about Extended LTS security advisories can be found in the dedicated section of our website.