CVE-2026-82880
Received Received - Intake

XML External Entity Injection in YaCy Search Server

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: VulnCheck

Description
YaCy Search Server through 1.941 contains an XML external entity injection vulnerability in SVG, FreeMind, and OpenSearch parsers that fail to disable external entity resolution. Attackers can publish malicious documents with DOCTYPE declarations containing SYSTEM entities pointing to local files, causing the crawler to exfiltrate file contents into the searchable index.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-82880
EUVD
EUVD-2026-68466

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
yacy yacy_search_server 1.941
freemind freemind *
opensearch opensearch *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-611 The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Attack-Flow Graph

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Executive Summary

This vulnerability is an XML External Entity (XXE) injection flaw in the YaCy Search Server through version 1.941. The SVG, FreeMind, and OpenSearch parsers fail to disable external entity resolution, allowing attackers to craft malicious documents with DOCTYPE declarations containing SYSTEM entities that reference local files. When processed by the crawler, this can lead to the exfiltration of sensitive file contents into the searchable index.

Detection Guidance

To detect this XXE vulnerability in YaCy Search Server, inspect network traffic for requests to SVG, FreeMind, or OpenSearch parsers containing DOCTYPE declarations with SYSTEM entities. Check logs for unusual file exfiltration into the search index. Use tools like curl to test parsers with crafted XML payloads referencing local files.

Impact Analysis

An attacker could exploit this to read sensitive files on the server, such as /etc/passwd or configuration files, and make their contents searchable via the YaCy index. This could expose confidential data, credentials, or system information to unauthorized users.

Compliance Impact

This vulnerability could lead to unauthorized access and exposure of personal or sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Non-compliance may result in legal penalties, fines, or reputational damage.

Mitigation Strategies

Update YaCy Search Server to a patched version where SAXParserFactory disables doctype declarations and external entities. If immediate update is not possible, disable SVG, FreeMind, and OpenSearch parsers in configuration. Monitor for unauthorized file access in logs and search index.

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