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CVE-2026-48103— GHSL-2026-119 7-Zip WIM SecurityId OOB read

Quick assessment

Affected
mcmilk 7-Zip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

7-Zip是7-Zip开源的一个压缩软件。 7-Zip 9.34版本至26.00版本存在缓冲区错误漏洞，该漏洞源于WIM存档处理器的安全描述符查找中存在差一堆越界读取，可能导致拒绝服务和信息泄露。

CVSS 4.3 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcmilk 7-Zip >= 9.34, < 26.01 affected
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I. Basic Information for CVE-2026-48103

Vulnerability Information
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Vulnerability Title
GHSL-2026-119 7-Zip WIM SecurityId OOB read
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
7-Zip 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
7-Zip是7-Zip开源的一个压缩软件。 7-Zip 9.34版本至26.00版本存在缓冲区错误漏洞，该漏洞源于WIM存档处理器的安全描述符查找中存在差一堆越界读取，可能导致拒绝服务和信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mcmilk 7-Zip >= 9.34, < 26.01 -

II. Public POCs for CVE-2026-48103

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III. Intelligence Information for CVE-2026-48103

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Same Patch Batch · mcmilk · 2026-06-05 · 8 CVEs total

CVE-2026-48095 8.8 HIGH GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer un
CVE-2026-48112 6.5 MEDIUM GHSL-2026-122 7-Zip Ar SYMDEF OOB Read
CVE-2026-48101 6.5 MEDIUM GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure
CVE-2026-48092 4.3 MEDIUM 7-Zip SquashFS Fragment Offset Overflow (GHSL-2026-116)
CVE-2026-48111 4.3 MEDIUM GHSL-2026-121 7-Zip UEFI DEPEX OOB Read
CVE-2026-48104 4.2 MEDIUM GHSL-2026-120: 7-Zip SquashFS BlockToNode uninitialized heap read
CVE-2026-48102 3.1 LOW GHSL-2026-118: 7-Zip UDF Field OOB Read

IV. Related Vulnerabilities

Same product: 7-Zip
Same vendor: mcmilk
Same weakness: CWE-125

V. Comments for CVE-2026-48103

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