------------------------------------------------------------------------- Debian LTS Advisory DLA-4481-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Tobias Frost February 17, 2026 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : libpng1.6 Version : 1.6.37-3+deb11u2 CVE ID : CVE-2026-22695 CVE-2026-22801 CVE-2026-25646 Debian Bug : 1125443 1125444 1127566 Multiple vulnerabilties have been found in libpng, the official PNG reference library, allowing information disclosure via out-of-bounds read, 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 11 bullseye, these problems have been fixed in version 1.6.37-3+deb11u2. 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/libpng1.6 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS
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