https://github.com/ImageMagick/ImageMagick/blob/master/coders/txt.c#L121

diff --git a/coders/txt.c b/coders/txt.c
index cffac6b5f2eeb8df203d8737fd8001db6403c0da..7da066b7a11d45fe120755a6ae3db64287eaee74 100644 (file)
--- a/coders/txt.c
+++ b/coders/txt.c
@@ -118,7 +118,7 @@ static MagickBooleanType IsTXT(const unsigned char *magick,const size_t length)
     return(MagickFalse);
   if (LocaleNCompare((const char *) magick,MagickID,strlen(MagickID)) != 0)
     return(MagickFalse);
-  count=(ssize_t) sscanf((const char *) magick+32,"%lu,%lu,%lu,%s",&columns,
+  count=(ssize_t) sscanf((const char *) magick+32,"%lu,%lu,%lu,%32s",&columns,
     &rows,&depth,colorspace);
   if (count != 4)
     return(MagickFalse);