Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-48101— GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure

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版本存在安全漏洞，该漏洞源于UEFI胶囊解析器中未初始化内存泄露，可能导致攻击者通过截断文件使未读取的堆缓冲区保留未初始化内存并暴露为提取文件内容。

CVSS 6.5 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
mcmilk 7-Zip >= 9.21, < 26.01 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-48101

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure
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 An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 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:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
7-Zip 安全漏洞
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版本存在安全漏洞，该漏洞源于UEFI胶囊解析器中未初始化内存泄露，可能导致攻击者通过截断文件使未读取的堆缓冲区保留未初始化内存并暴露为提取文件内容。
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 >= 9.21, < 26.01 -

II. Public POCs for CVE-2026-48101

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-48101

请登录查看更多情报信息。

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-2026-48092 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-2026-48103 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-908

V. Comments for CVE-2026-48101

No comments yet

Leave a comment