CVE-2026-14587 Affecting neo4j-2025.06 package, versions *


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.37% (30th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-NEO4J202506-19154921
  • published21 Aug 2026
  • disclosed5 Aug 2026

Introduced: 5 Aug 2026

NewCVE-2026-14587  (opens in a new tab)

How to fix?

There is no fixed version for Minimos:latest neo4j-2025.06.

NVD Description

Note: Versions mentioned in the description apply only to the upstream neo4j-2025.06 package and not the neo4j-2025.06 package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1