Images will be loaded from an external source (e.g. http://example.com/img.png) only if the reader is explicitly set to allow it via `$reader->setAllowExternalImages(true)`.
* All Readers - Allow or Forbid Fetching of External Images Release210
Add to all readers the option to allow or forbid fetching external images. This is unconditionally allowed now. The default will be set to "allow", so no code changes are necessary. However, we are giving consideration to changing the default.
* Update Changelog
* Allow Xlsx Reader to Specify ParseHuge Release210
Fix#4260. A number of Security Advisories related to libxml_options were opened. In the end, we disabled the ability to specify any libxml_options. However, some users were adversely affected because they needed LIBXML_PARSEHUGE for some of their files. Having finally obtained access to a file demonstrating this problem, we can restore this ability.
- The operation is potentially dangerous, a vector for memory leaks and out-of-memory errors. It is not recommended unless absolutely needed.
- It will not be permitted as a global (static) property with the ability to adversely affect other users on the same server.
- It will instead be implemented as an instance property of Xlsx Reader (default to false), with a setter. I do not see a use case for a getter.
- People will need to set this property individually for each file which they think needs it.
- This change will be backported to all supported releases.
- The sheer size and processing time for the file involved makes it impractical to add a formal test case. It has, nevertheless, been tested satisfactorily.
* Update CHANGELOG.md
Fix#4249. Technically speaking, only the 1.29 branch needs fixing, and only for TEXT. It was fixed for the other branches by PR #3898. However, in adding test cases for the fix, it became apparent that PhpSpreadsheet's parsing in TIMEVALUE (which is called from TEXT in the original issue) did not really match Excel's. There are probably still edge cases where it doesn't, but, in the absence of a spec for how it operates, this will do for now.
We do not usually backport fixes from the master branch. Because this is more of a forward port from the earlier branch, there is an equivalent PR for each active branch.
Backport of #4241. Some security batches caused a minor break in Drawings, forcing `setWorksheet` to come after `setPath`. Although the problem is easily fixed in user code, this was not an intended change. Some slight recoding restores the earlier functionality where the order of calls was not important, without sacrificing the security gains.
oleibman
