CLSA-2026-1774027236 Fix CVE(s): CVE-2026-27798

SECURITY UPDATE: heap buffer over-read with wavelet-denoise operator - debian/patches/CVE-2026-27798.patch: use 4columns instead of 3columns for resource and memory allocation in WaveletDenoiseImage to prevent over-read when processing small-dimension images - CVE-2026-27798...