{"id":15847,"date":"2026-09-04T19:04:33","date_gmt":"2026-09-04T11:04:33","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-48095"},"modified":"2026-09-04T19:04:33","modified_gmt":"2026-09-04T11:04:33","slug":"cve-2026-48095","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-48095","title":{"rendered":"CVE-2026-48095 [HIGH] &#8211; 7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a"},"content":{"rendered":"<p>7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 &lt;= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86\/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching &#8220;NTFS    &#8221; at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuS<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15847","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15847","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15847"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15847"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15847"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}