Vulnerability · NVD

CVE-2026-48103

CVE-2026-48103, medium severity (CVSS 4.3): 1 tracked app concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 4.3
Exploitation: 0.3 %
Tracked apps: 1
Still exposed: 0

Published on 2026-06-05

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.

Attack vector : Network No privileges required

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS 0.34% exploit very unlikely percentile 24.3%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

7-Zip Windows winget:7zip.7zip

Affected ≥9.34 <26.01 Fixed in 26.01 Latest tracked 26.03 patched

Observed affected builds (19)

26.00 25.01 25.00 24.09 24.08 24.07 24.06 24.05 23.01 22.01 22.00 21.07 21.06 19.00 19.00.00.0 18.06 18.05 18.01 16.04

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
7-zip	7-zip All platforms (wildcard)	All platforms (wildcard)	≥9.34 <26.01	cpe:2.3:a:7-zip:7-zip::::::::

View on NVD ↗ Advisory · securitylab.github.com

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