There is an off by one vulnerability in cairo, reading the jpeg headers of an image surface.

The vulnerability is at cairo-image-info.c:76:

 70 static const unsigned char *
 71 _jpeg_skip_segment (const unsigned char *p)
 72 {
 73     int len;
 74 
 75     p++;
 76     len = (p[0] << 8) | p[1];
 77 
 78     return p + len;
 79 }

The off by one happens while reading the variable p[1].

This function is called from line cairo-image-info.c:143:

139 
140             if (p + 2 > data + length)
141                 return CAIRO_INT_STATUS_UNSUPPORTED;
142 
143             p = _jpeg_skip_segment (p);
144             break;
145         }

The check here should be >= instead of >:
140             if (p + 2 >= data + length)

Since in _jpeg_skip_segment 3 bytes are consumed (1 skipped and 2 read).

If an attacker could control p[1] then he could control how many bytes are skipped reading the jpeg segment. It doesn't look this vulnerability has security implications since the function _cairo_image_info_get_jpeg_info is validating that the pointer is inside the bounds.