GHSA-fhp4-pr5j-46m5: Muhammara has a NULL pointer dereference in LZWDecode filter when DecodeParms omits EarlyChange key

June 26, 2026

A NULL pointer dereference vulnerability exists in PDFParser::CreateFilterForStream() when processing a PDF stream with /Filter /LZWDecode and a /DecodeParms dictionary that does not contain the EarlyChange key. This causes an access violation (0xC0000005) and crashes the process.

References

github.com/advisories/GHSA-fhp4-pr5j-46m5
github.com/julianhille/MuhammaraJS/commit/a98c07780241353334eb65bfca1df025f14be70b
github.com/julianhille/MuhammaraJS/security/advisories/GHSA-fhp4-pr5j-46m5

Code Behaviors & Features

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