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CVE-2026-48111— GHSL-2026-121 7-Zip UEFI DEPEX 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 9.21版本至26.00版本存在缓冲区错误漏洞，该漏洞源于UEFI固件镜像解析器的ParseDepedencyExpression函数中存在差一越界读取，可能导致拒绝服务或信息泄露。

CVSS 4.3 · Medium EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcmilk 7-Zip >= 9.18, < 26.01 affected
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I. Basic Information for CVE-2026-48111

Vulnerability Information
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Vulnerability Title
GHSL-2026-121 7-Zip UEFI DEPEX OOB Read
Source: CVE Program / CVE List V5
Vulnerability Description
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an off-by-one out-of-bounds read vulnerability in the ParseDepedencyExpression function of the UEFI firmware image parser(CPP/7zip/Archive/UefiHandler.cpp). The function validates an attacker-controlled opcode byte using > instead of >= against the element count of the 10-entry kExpressionCommands static array, allowing an opcode value of 10 to read one pointer slot (8 bytes on x64) past the end of the array in .rodata. The out-of-bounds value is then dereferenced as a const char * and passed through strlen and memcpy into the archive's Characts property, which may cause either a denial of service (access violation when the adjacent bytes do not form a valid readable pointer) or a minor information disclosure of an adjacent .rdata string literal into archive metadata. The vulnerability is reached automatically during IInArchive::Open() via the call path OpenFv/OpenCapsule → ParseVolume → ParseSections when processing a SECTION_DXE_DEPEX (0x13) or SECTION_PEI_DEPEX (0x1B) section whose first body byte is 0x0A, and the UEFI handler is enabled by default in stock 7z.dll with signature-based detection for both UEFIc and UEFIf formats. The outcome (crash vs. silent leak) is deterministic per build but linker-layout dependent, with no write primitive and no disclosure of heap data, secrets, or ASLR base addresses. Version 26.01 fixes the issue.
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 9.21版本至26.00版本存在缓冲区错误漏洞，该漏洞源于UEFI固件镜像解析器的ParseDepedencyExpression函数中存在差一越界读取，可能导致拒绝服务或信息泄露。
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 >= 9.18, < 26.01 -

II. Public POCs for CVE-2026-48111

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III. Intelligence Information for CVE-2026-48111

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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-2026-48103 4.3 MEDIUM GHSL-2026-119 7-Zip WIM SecurityId 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-2026-48111

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