SECURITY UPDATE: out-of-bounds heap write in VIFF encoder due to integer
truncation on 32-bit builds
debian/patches/CVE-2026-33900.patch: add overflow check in
WriteVIFFImage to reject packets values that truncate when cast to
size_t, preventing a heap write beyond the allocated buffer
CVE-2026-33900
SECURITY UPDATE: out-of-bounds read in -sample operation via user
supplied sample:offset artifact
debian/patches/CVE-2026-33905.patch: rewrite SampleImage to compute
per-pixel x/y offsets inside the inner loop and fetch one virtual
pixel at a time, so out-of-range offsets no longer index past the
bounds of the source scan line; restores the PseudoClass/CMYK
index-queue guard accidentally dropped in the original fix