Answer in brief
CVE-2026-14587 records a Unknown severity vulnerability in Unathenticated connection can hold Bolt channel open. The current sources do not mark it as known exploited. The current feed maps neo4j/Community Edition (generic), neo4j/Enterprise Edition (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps neo4j/Community Edition (generic), neo4j/Enterprise Edition (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| neo4j/Community Editiongeneric | >=2025.01 <2026.07 || >=5.0 <5.26.29 | 2026.07, 5.26.29 |
| neo4j/Enterprise Editiongeneric | >=2025.01 <2026.07 || >=5.0 <5.26.29 | 2026.07, 5.26.29 |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-14587 records a Unknown severity vulnerability in Unathenticated connection can hold Bolt channel open. The current sources do not mark it as known exploited. The current feed maps neo4j/Community Edition (generic), neo4j/Enterprise Edition (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps neo4j/Community Edition (generic), neo4j/Enterprise Edition (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| neo4j/Community Editiongeneric | >=2025.01 <2026.07 || >=5.0 <5.26.29 | 2026.07, 5.26.29 |
| neo4j/Enterprise Editiongeneric | >=2025.01 <2026.07 || >=5.0 <5.26.29 | 2026.07, 5.26.29 |
Published upstream
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.