CVE-2025-11602
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
A potential information leak in the bolt protocol handshake in Neo4j Enterprise and Community editions allows an attacker to obtain one byte of information from previous connections. The attacker has no control over the information leaked in server responses.
Risk Assessment
A small amount of data from previous connections may leak, which under certain scenarios could contribute to disclosure of sensitive information.
Recommendation
Update Neo4j to the version containing the fix. Monitor for unusual connections and consider restricting access to the bolt port.
Other vulnerabilities in Neo4j
See all- CVE-2026-14587High
A vulnerability in Neo4j's Bolt modern handshake decoder treats an overlong capability bit mask the same as a truncated one. An unauthenticated client can send a selected protocol version with 32 continuation bytes, causing the decoder to reset the reader index and wait for more bytes instead of rejecting the message. The channel remains open, which can be exploited before authentication.
- CVE-2026-1337Medium
Insufficient escaping of unicode characters in query log in Neo4j Enterprise and Community editions prior to 2026.01 can lead to XSS if the user opens the logs in a tool that treats them as HTML. There is no security impact on Neo4j products, but this advisory is released as a precaution to treat the logs as plain text if using versions prior to 2026.01.
- CVE-2024-34517Medium
The Cypher component in Neo4j 5.0.0 through 5.18 mishandles IMMUTABLE privileges in some situations where an attacker already has admin access.
Original NVD description (English source)
Potential information leak in bolt protocol handshake in Neo4j Enterprise and Community editions allows attacker to obtain one byte of information from previous connections. The attacker has no control over the information leaked in server responses.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS