Re: C file recoginzed as image file

[Richard Stallman]

      And in case there's a vulnerability in libpng, he would not
    expect to be in danger when opening something.jpg.

He probably won't expect to be in danger when opening something.png,
because he probably won't know about the vulnerability.

    For most GNU/Linux systems, the vulnerable image libraries will be
    replaced by fixed versions via (automatic) online updates soon.

That is true for many users, but there is a substantial fraction that,
like me, hardly ever updates software.