CVE-2026-59691: rfbsrc: write pixels at the negotiated bytes-per-pixel in
rfb_decoder_fill_rectangle and read colour values through the new
rfb_decoder_get_pixel helper, instead of always using 32-bit accesses
CVE-2026-59692: dtlsconnection: heap-allocate the peer certificate subject DN
buffer from the X509_NAME_print_ex length in openssl_verify_callback, instead
of printing into a fixed 2048-byte stack buffer