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libheif v1.21.0 Null Pointer Dereference in std::vector<unsigned>::empty

From: Ron E <ronaldjedgerson () gmail com>
Date: Sat, 23 Aug 2025 10:22:34 -0400

During construction of a Track_Visual object, corrupted sequence metadata
can leave a std::vector<unsigned> uninitialized. When .empty() is called,
it attempts to dereference a null object.

*Root Cause:*

   -

   Missing input validation when constructing vectors from parsed boxes.

*Impact:*

   -

   Application crash (DoS).
   -

   Not exploitable for code execution.

*Evidence:*

==1174955==ERROR: AddressSanitizer: SEGV in std::vector<unsigned>::empty()
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libheif v1.21.0 Null Pointer Dereference in std::vector<unsigned>::empty Ron E (Sep 08)