CVE-2026-85709 LightRAG: Sensitive Information Exposure Through Raw Exception Messages in API Error Responses
Unauthenticated attackers can trigger errors to expose sensitive server configuration, database credentials, and internal paths via raw exception messages.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-85709?
CVE-2026-85709 is a medium-severity vulnerability in HKUDS LightRAG, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the LightRAG API server returns raw Python exception text from error handlers in document_routes.py, graph_routes.py, query_routes.py, ollama_api.py, and lightrag_server.py. The detail=str(e), detail=str(exc), and equivalent formatted-message paths expose server filesystem paths, database host, port, user, and database names, language-model provider diagnostics, configuration details, and Python library internals to a network client that can trigger an error. The default unauthenticated configuration makes those responses reachable without credentials, and URI-configured backends can disclose connection strings containing credentials depending on the underlying driver error. This issue is fixed in version 1.5.5.
Weakness: CWE-209
Which versions are affected by CVE-2026-85709?
3 open source packages ship an affected version, including lightrag-hku.
| Package | Affected | Fixed in |
|---|---|---|
lightrag-hku PyPI | All versions | 1.5.5 |
lightrag-hku PyPI | All versions | 1.5.5 |
lightrag-hku PyPI | All versions | 1.5.5 |
How do I fix CVE-2026-85709?
Upgrade lightrag-hku to 1.5.5 or later.
Is CVE-2026-85709 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85709 exists.
Sources
Also known as GHSA-hrmj-7rvj-4hg8, PYSEC-2026-4063.