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3 vulnerabilities found for lookyloo by lookyloo
GCVE-1-2026-20075 (CVE-2026-66913)
Vulnerability from gna-1 – Published: 2026-07-28 12:18 – Updated: 2026-07-28 12:19
VLAI
EPSS
VEX
Title
Zip Bomb in Lookyloo Capture Upload Allows Denial of Service
Summary
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.
Severity
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Lookyloo/lookyloo/commit/96589… | patch |
Impacted products
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"value": "\u003cp\u003eLookyloo did not enforce limits on the decompressed size of uploaded capture archives and compressed HAR files.\u003c/p\u003e\u003cp\u003eAn 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.\u003c/p\u003e\u003cp\u003eThe 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.\u003c/p\u003e\u003cp\u003eThe patch introduces:\u003c/p\u003e\u003cul\u003e\u003cli\u003eA 1 GB cumulative uncompressed-size limit for imported capture archives.\u003c/li\u003e\u003cli\u003eSize-limited gzip and zlib decompression for compressed HAR files.\u003c/li\u003e\u003cli\u003eExplicit detection and handling of suspected zip bombs.\u003c/li\u003e\u003cli\u003eAn HTTP 400 response when an oversized compressed HAR file is submitted through the API.\u003c/li\u003e\u003c/ul\u003e\u003cbr\u003e"
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"attackVector": "NETWORK",
"baseScore": 6.9,
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GCVE-1-2026-20140 (CVE-2026-66824)
Vulnerability from gna-1 – Published: 2026-07-27 19:56 – Updated: 2026-07-27 19:58
VLAI
EPSS
VEX
Title
Stored Cross-Site Scripting via Unsafe Capture Tree JSON Embedding
Summary
A stored cross-site scripting vulnerability existed in the capture tree visualization page. The application embedded the serialized capture tree directly into an inline JavaScript block using the Jinja safe filter.
Because the tree data can contain values derived from captured and potentially attacker-controlled web content, a specially crafted value could prematurely terminate the surrounding <script> element and inject arbitrary HTML or JavaScript. The malicious code would execute in the browser of a user viewing the affected capture tree.
Successful exploitation could allow an attacker to perform actions using the victim’s authenticated session, access information available to the victim, or modify application data within the permissions of the affected user.
The patch removes the JSON data from the HTML document and retrieves it through a dedicated API endpoint. The client then processes the response using response.json(), preventing capture data from being interpreted as executable content within the original page’s HTML or JavaScript context.
Severity
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Lookyloo/lookyloo/commit/39518… | patch |
Impacted products
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"version": "0",
"versionType": "semver"
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"credits": [
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"lang": "en",
"type": "remediation developer",
"value": "Raphael Vinot"
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"type": "finder",
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GCVE-1-2025-0018 (CVE-2025-65095)
Vulnerability from gna-1 – Published: 2025-11-18 15:33 – Updated: 2025-11-18 20:39
VLAI
EPSS
VEX
Title
HTML injection issue was identified in Lookyloo’s web interface helper function
Summary
A HTML injection issue was identified in Lookyloo’s web interface helper function shorten_string (website/web/__init__.py). The function was used to truncate and render user-controlled values inside HTML (for example in a <span title="..."> attribute) without first escaping the string. This allowed crafted input containing HTML to be injected into the rendered page.
On a standard Lookyloo installation, the configured Content Security Policy (CSP) significantly limited the impact and prevented direct script execution in most scenarios, but the underlying HTML injection bug was still present and could become exploitable if CSP was relaxed or modified.
Severity
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Lookyloo/lookyloo/commit/ac2f7… | patch |
| https://github.com/Lookyloo/lookyloo/security/adv… | vendor-advisory |
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