[pkg-lxqt-devel] Bug#974616: nomacs: "charset=Ascii" appears before the comment of the image

Antoine Beaupré anarcat at debian.org
Sun Apr 4 18:47:01 BST 2021

On 2020-12-14 23:45:06, Vincent Lefevre wrote:
> Control: retitle -1 nomacs uses internal libexiv2 functions to get the user comment
> Control: severity -1 serious
> Control: tags -1 - patch
> On 2020-12-12 21:59:38 +0100, Vincent Lefevre wrote:
>> I'm attaching the patch I've written. There was already a function
>> that removes substrings of the form 'charset="ASCII"' case
>> insensitively. So I do the same thing with 'charset=ASCII'
>> (i.e. without the double-quotes) and 'charset=Unicode', which
>> appears when the string has non-ASCII characters.
>> Note that this function is a hack: it will remove real occurrences
>> of such strings, not just those added by libexiv2. However, there
>> is very little probability that such strings really appear in the
>> comment. And one cannot do much better to fix the issue.
> This is just a workaround that seems to work with the current
> libexiv2 version, but according to the upstream libexiv2 maintainer,
> nomacs uses some internal libexiv2 function, which means that an
> update of libexiv2 can break it at any time, potentially introducing
> security issues.
> Note that a change of behavior could have already been seen with the
> upgrade of libexiv2-27 to 0.27.3 with the appearance of spurious data
> before the comment.
> The correct way to get the comment with the public API is
>   std::string comment = Exiv2::CommentValue(value().toString()).comment());
> Note: The upstream nomacs version comes with a bundled libexiv2,
> meaning that this may not be an issue to use internal libexiv2
> features. Debian chose to use the shared library, thus it needs
> to replace these internals by calls to the public API.

Is this fixed upstream, in the latest 3.16 release?

I mean I understand that it *still* bundles exiv2 and friends:


... but maybe their usage of the library improved?

There is #974617 for upgrading to 3.16...


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