CVE-2026-48103
MediumCVSS 4.3Summary
7-Zip versions 9.34 through 26.00 contain an off-by-one vulnerability in the WIM archive handler, leading to out-of-bounds read. An attacker can control the security identifier, allowing for application crashes.
Risk Assessment
The vulnerability may lead to denial of service and minor information disclosure, but does not pose a significant threat as it does not allow for data writing.
Recommendation
It is recommended to update 7-Zip to the latest version to mitigate this vulnerability and to monitor logs for potential exploitation attempts.
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Original NVD description (English source)
7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId >= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe's ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS