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CVE-2026-66913— Zip Bomb in Lookyloo Capture Upload Allows Denial of Service

Quick assessment

Affected
lookyloo lookyloo
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.

Lookyloo是Lookyloo组织开源的一个网站捕获工具。 Lookyloo 1.40.0及之前版本存在资源管理错误漏洞，该漏洞源于未对上传的捕获档案和压缩HAR文件的解压大小进行限制，直接解压内容到内存，可能耗尽可用内存，导致拒绝服务。

CVSS 6.9 · Medium EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
lookyloo lookyloo ≤ 1.40.0 affected
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I. Basic Information for CVE-2026-66913

Vulnerability Information
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Vulnerability Title
Zip Bomb in Lookyloo Capture Upload Allows Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Lookyloo did not enforce limits on the decompressed size of uploaded capture archives and compressed HAR files. An attacker could submit a specially crafted ZIP, gzip, or zlib-compressed capture containing data that expands to a very large size during processing. Because the application decompressed this content directly in memory without first limiting the output size, processing the malicious capture could exhaust available memory, terminate a web or worker process, or make the Lookyloo instance unavailable. The vulnerability affects both full Lookyloo capture archive imports and API submissions containing gzip-compressed HAR data. Repeated exploitation could cause a persistent denial-of-service condition until the affected processes or instance are restarted. The patch introduces: * A 1 GB cumulative uncompressed-size limit for imported capture archives. * Size-limited gzip and zlib decompression for compressed HAR files. * Explicit detection and handling of suspected zip bombs. * An HTTP 400 response when an oversized compressed HAR file is submitted through the API.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Lookyloo 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Lookyloo是Lookyloo组织开源的一个网站捕获工具。 Lookyloo 1.40.0及之前版本存在资源管理错误漏洞，该漏洞源于未对上传的捕获档案和压缩HAR文件的解压大小进行限制，直接解压内容到内存，可能耗尽可用内存，导致拒绝服务。
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
lookyloo lookyloo 0 ~ 1.40.0 -

II. Public POCs for CVE-2026-66913

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III. Intelligence Information for CVE-2026-66913

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Patches & Fixes for CVE-2026-66913 (1)

IV. Related Vulnerabilities

Same product: lookyloo
Same vendor: lookyloo
Same weakness: CWE-400

V. Comments for CVE-2026-66913

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