XXE in Yacy Search Server
CVE-2026-82880
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.
Vulnerability class: XXE (XML External Entity)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/yacy/yacy_search_server/issues/818 (issue-tracking)
- github.com/yacy/yacy_search_server/commit/3c3a307e8b7a0ebbc4d1e6b10898b52e15c0c… (patch)
- github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/… (technical-description)
- github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/… (technical-description)
- github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/… (technical-description)
- github.com/yacy/yacy_search_server (product)
- www.vulncheck.com/advisories/yacy-search-server-through-1.941-xml-external-enti… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82880?
- CVE-2026-82880 is a high-severity vulnerability in Yacy Search Server, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2026-08-31.
- How severe is CVE-2026-82880?
- High severity. CVSS v3 base score is 7.5 out of 10.