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CVE-2026-55195— py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size

Quick assessment

Affected
miurahr py7zr
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.

Hiroshi Miura py7zr是日本Hiroshi Miura个人开发者的一个7z文件压缩解压的Python库。 Hiroshi Miura py7zr 1.1.3之前版本存在资源管理错误漏洞，该漏洞源于Worker.decompress()函数提取存档条目时未跟踪总解压大小，可能导致磁盘或内存耗尽。

AI Predicted 7.5 Difficulty: Easy EPSS 0.32% · P23

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
miurahr py7zr < 1.1.3 affected
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I. Basic Information for CVE-2026-55195

Vulnerability Information
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Vulnerability Title
py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size
Source: CVE Program / CVE List V5
Vulnerability Description
py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Hiroshi Miura py7zr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hiroshi Miura py7zr是日本Hiroshi Miura个人开发者的一个7z文件压缩解压的Python库。 Hiroshi Miura py7zr 1.1.3之前版本存在资源管理错误漏洞，该漏洞源于Worker.decompress()函数提取存档条目时未跟踪总解压大小，可能导致磁盘或内存耗尽。
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
miurahr py7zr < 1.1.3 -

II. Public POCs for CVE-2026-55195

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III. Intelligence Information for CVE-2026-55195

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Patches & Fixes for CVE-2026-55195 (2)

Vendor Advisories for CVE-2026-55195 (1)

IV. Related Vulnerabilities

Same product: py7zr
Same vendor: miurahr
Same weakness: CWE-409

V. Comments for CVE-2026-55195

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