Neo4j Enterprise Edition/Community Edition up to 5.26.28/2026.6 Bolt Modern Handshake Decoder resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k1.84

Summaryinfo

A vulnerability categorized as problematic has been discovered in Neo4j Enterprise Edition and Community Edition up to 5.26.28/2026.6. Affected by this issue is some unknown functionality of the component Bolt Modern Handshake Decoder. The manipulation results in resource consumption. This vulnerability is known as CVE-2026-14587. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Neo4j Enterprise Edition and Community Edition up to 5.26.28/2026.6. Affected is an unknown functionality of the component Bolt Modern Handshake Decoder. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at neo4j.com. This vulnerability is traded as CVE-2026-14587 since 07/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 5.26.29 or 2026.07 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Enterprise Edition/Community Edition 5.26.29/2026.07

Timelineinfo

07/03/2026 CVE reserved
08/05/2026 +33 days Advisory disclosed
08/05/2026 +0 days VulDB entry created
08/05/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: neo4j.com
Status: Confirmed

CVE: CVE-2026-14587 (🔒)
GCVE (CVE): GCVE-0-2026-14587
GCVE (VulDB): GCVE-100-386310

Entryinfo

Created: 08/05/2026 19:30
Changes: 08/05/2026 19:30 (54)
Complete: 🔍
Cache ID: 216::103

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