lightrag-hku: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard

Summary LightRAG's native markdown parser downloads external images referenced by an uploaded markdown or textpack document. The only SSRF guard, validatedaddresses in lightrag/parser/markdown/parser.py, resolves the image host and rejects it when the resolved IP is not isglobal. That check is...

lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks

Summary The POST /login endpoint has no rate limiting, account lockout, or delay on failed attempts. An attacker can submit unlimited password guesses at full network speed. Details python lightrag/api/lightragserver.py:2161 @app.post"/login" async def loginformdata: OAuth2PasswordRequestForm =...

lightrag-hku: Plaintext Passwords Compared Without Constant-Time Function

Summary When plaintext passwords are stored in AUTHACCOUNTS, the comparison uses Python's == operator which is not constant-time. An attacker with low-latency access can exploit timing differences to recover the password character by character. Details python lightrag/api/passwords.py:13-26 def...

lightrag-hku: Sensitive Information Exposure Through Raw Exception Messages in API Error Responses

Summary The LightRAG API server passes raw Python exception messages directly into HTTP error responses across 30+ error handlers in every router. When combined with the default unauthenticated configuration see companion report on CWE-306, any network-reachable client can trigger exceptions whos...

EUVD-2026-84549

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, validatedaddresses in lightrag/parser/markdown/parser.py evaluates the literal resolved address with ipaddress.isglobal without consistently classifying an IPv4 address embedded in an IPv6 transition wrapper. A call...

EUVD-2026-84546

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, verifypassword in lightrag/api/passwords.py compares plaintext AUTHACCOUNTS password values with Python's == operator. The comparison can return after the first mismatching byte, creating response-time differences...

Use of Hard-coded Credentials

Overview lightrag-hku is a LightRAG: Simple and Fast Retrieval-Augmented Generation Affected versions of this package are vulnerable to Use of Hard-coded Credentials in the authentication process when a hardcoded default token secret is used and certain endpoints such as /auth-status and /login a...

Improper Authentication

Overview lightrag-hku is a LightRAG: Simple and Fast Retrieval-Augmented Generation Affected versions of this package are vulnerable to Improper Authentication via the file lightrag/api/config.py that uses a default JWT secret "lightrag-jwt-default-secret" when the TOKENSECRET environment variabl...

Path Traversal

lightrag-hku is vulnerable to Path Traversal. The vulnerability is due to improper validation of user-supplied filenames due to unsanitized input in the file.filename parameter in the uploadtoinputdir function, allowing an attacker to write files to arbitrary locations on the server...