Unchecked Return Value to NULL Pointer Dereference in PDFDocumentHandler.cpp
### Impact
The package muhammara before 2.6.0; all versions of package hummus are vulnerable to Denial of Service (DoS) when supplied with a maliciously crafted PDF file to be appended to another.
### Patches
It has been patched in 2.6.0 for muhammara and not at all for hummus
### Workarounds
Do not process files from untrusted sources
### References
PR:
https://github.com/julianhille/MuhammaraJS/pull/194
Issue:
https://github.com/julianhille/MuhammaraJS/issues/191
Issue in hummus:
https://github.com/galkahana/HummusJS/issues/293
### Outline differences to
https://nvd.nist.gov/vuln/detail/CVE-2022-25892
The difference is one is in src/deps/PDFWriter/PDFParser.cpp
https://github.com/julianhille/MuhammaraJS/commit/1890fb555eaf171db79b73fdc3ea543bbd63c002#diff-09ac2c64aeab42b14b2ae7b11a5648314286986f8c8444a5b3739ba7203b1e9b and the other is PDFDocumentHandler.cpp
https://github.com/julianhille/MuhammaraJS/pull/194/files#diff-38d338ea4c047fd7dd9a05b5ffe7c964f0fa7e79aff4c307ccee7596457b1ef2 both is a null pointer but for different cases
These are totally diffent issues, one is in reading a pdf the other is in appendending a maliciously crafted one. The function calls are different the versions in which they are solved are diffent.