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Advisories

7-Zip before 26.06 Heap Out-of-Bounds Write via LZX Decoder in CAB Extraction

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Severity
high
Date
Affecting

  • 7-Zip >= 0, < 26.06

CWE
  • CWE-787 Out-of-bounds Write
CVSS
8.5
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Nguyễn Trần Thanh Lâm of Nanyang Technological University, and other researchers who wished to remain anonymous
Description
7-Zip before 26.06 contains a heap out-of-bounds write vulnerability in the LZX decoder that lets attackers corrupt memory when a continuation CAB volume declares a smaller window. Attackers can entice victims to extract crafted multi-volume CAB archives, where a stale _pos value bypasses bounds checks, enabling arbitrary code execution.

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