cURL Error Number 77 when trying to inject an image

When I’m trying to inject an image, I get:

flickr error: cURL Error Number 77: error setting certificate verify locations: CAfile: /wordpress/core/4.6.1/wp-content/plugins/wp-inject/cert/cacert.pem CApath: /etc/ssl/certs/

According to https://curl.haxx.se/libcurl/c/libcurl-errors.html :

– – – – –
CURLE_SSL_CACERT_BADFILE (77)
Problem with reading the SSL CA cert (path? access rights?)
– – – – –

At first I thought there was something wrong with my web host (Pressable), but they investigated this issue and came to the following conclusion:

– – – – –

The problem is that this plugin is trying to load the cert relative to ABSPATH.
With Pressable, ABSPATH only contains WordPress core files, and doesn’t include the plugin files.

CAfile: /wordpress/core/4.6.1/wp-content/plugins/wp-inject/cert/cacert.pem

This issue needs to be corrected by the plugin developer, as it is a design flaw.

They either need to use WP_PLUGIN_DIR or plugin_dir_path() or even better use the WordPress built in cacert bundle in wp-includes/certificates/ca-bundle.crt

It works on your other host only because most hosts have the plugins directory beneath ABSPATH, but not all hosts do.

Using WP_PLUGIN_DIR will guarantee compatibility with all path configuration across different hosts.

– – – – –

So posting this in the support forum because 1) I want to help others with the same problem 2) I do not know of any other way to submit a feature request to the developers of this plugin.