CVE-2026-66913
Severity CVSS v4.0:
MEDIUM
Type:
CWE-400
Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
28/07/2026
Last modified:
30/07/2026
Description
Lookyloo did not enforce limits on the decompressed size of uploaded capture archives and compressed HAR files.<br />
<br />
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.<br />
<br />
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.<br />
<br />
The patch introduces:<br />
<br />
* A 1 GB cumulative uncompressed-size limit for imported capture archives.<br />
* Size-limited gzip and zlib decompression for compressed HAR files.<br />
* Explicit detection and handling of suspected zip bombs.<br />
* An HTTP 400 response when an oversized compressed HAR file is submitted through the API.
Impact
Base Score 4.0
6.90
Severity 4.0
MEDIUM