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7-Zip is a file archiver with a high compression ratio. Versions 9.18 through 26.00 contain a heap out-of-bounds read in 7-Zip Ar handler BSD SYMDEF parser. A 4-byte heap out-of-bounds read exists in the Unix ar archive parser in 7-Zip. When parsing a BSD-style .SYMDEF symbol table, the ParseLibSymbols function reads a 32-bit namesSize field via Get32 at a position that can equal the buffer size, reading 4 bytes past the end of the heap allocation. This reads uninitialized heap data under the default allocator. Version 26.01 patches the issue.
Stack-based buffer overflow in the ARJ plugin (arj.dll) 3.9.2.0 for 7-Zip 3.13, 4.23, and 4.26 BETA, as used in products including Turbo Searcher, allows remote attackers to execute arbitrary code via a large ARJ block.