CVE-2026-14587
7.5 · HIGHOverview
CVE-2026-14587 is a high-severity vulnerability affecting neo4j neo4j. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Neo4j's Bolt modern handshake decoder treats an overlong capability bit mask the same way it treats a truncated bit mask. When an unauthenticated client sends a selected protocol version followed by 32 continuation bytes in the capability mask, the decoder resets the reader index and waits for more bytes instead of rejecting the protocol message and closing the channel.
Because the same unread bytes remain at the front of the decoder buffer, appending a terminating byte later does not recover the connection. The decoder re-reads the same first 32 continuation bytes, returns without producing a handshake-finalization message, and leaves the channel open.
This can be triggered before authentication by any client that can reach the Bolt connector.
Remediation
Check the references section for vendor advisories and patches from neo4j. Update neo4j to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| neo4j | neo4j | >= 5.0.0, < 5.26.29 | Affected |
References
Frequently Asked Questions
What is CVE-2026-14587?
CVE-2026-14587 is a high-severity vulnerability affecting neo4j neo4j. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-14587?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-14587?
Check the references section for vendor advisories and patches from neo4j. Update neo4j to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-14587?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-14587 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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