Blender Foundation vulnerabilities and threats

Blender before 4.5.15 and 5.x before 5.2.3 contains a heap out-of-bounds access vulnerability in read_struct() that skips size validation when a .blend file's SDNA struct layout compares equal. Attackers can supply a crafted .blend file with short blocks so field reads, writes, and pointer dereferences overrun heap memory, causing crashes or code execution.

Blender before 4.5.15 and 5.x before 5.2.3 contains an out-of-bounds read vulnerability in blo_bhead_id_* accessors in readfile.cc that read ID fields without block length checks. Attackers can supply a crafted .blend file with short ID blocks that, when browsed or appended from, causes heap over-reads leading to crashes or heap memory disclosure.

CVE-2026-119720 is a heap out-of-bounds read vulnerability in Blender versions before 4.5.15 and 5.x before 5.2.3. It occurs in the read_file_dna() function when processing a crafted .blend file with a truncated GLOB block, leading to a crash.

Blender versions before 4.5.15 and 5.x before 5.2.3 have a heap buffer overflow vulnerability in the blend file thumbnail extractor. This is caused by a 32-bit integer overflow in the thumb_data_vertical_flip() function. Maliciously crafted .blend files with specially designed TEST block dimensions can trigger out-of-bounds writes when previewed by blender-thumbnailer or the Windows shell extension, potentially leading to crashes or code execution.

Blender versions before 4.5.15 and 5.x before 5.2.3 have a heap buffer overflow vulnerability due to an integer overflow in the ptcache_data_alloc() function when reading point cache files. An attacker can craft a malicious point cache file with a large totpoint value alongside a .blend file to cause a crash or potentially execute arbitrary code with user privileges.