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CVE-2026-14587— Unathenticated connection can hold Bolt channel open

Quick assessment

Affected
neo4j Enterprise Edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Neo4j Enterprise Edition是美国Neo4j公司的一款企业级图数据库软件。 Neo4j Enterprise Edition 2025.01至2026.07之前版本和5.0至5.26.29之前版本，以及Neo4j Community Edition 2025.01至2026.07之前版本和5.0至5.26.29之前版本存在输入验证错误漏洞，该漏洞源于Bolt modern handshake解码器错误处理过长的能力位掩码，当未经身份验证的客户端发送选定的协议版本及32个连续字节后，解码

CVSS 5.5 · Medium EPSS 0.54% · P44

Affected Version Matrix 4

VendorProduct Version RangeStatus
neo4j Community Edition 2025.01< 2026.07 affected
5.0< 5.26.29 affected
neo4j Enterprise Edition 2025.01< 2026.07 affected
5.0< 5.26.29 affected
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I. Basic Information for CVE-2026-14587

Vulnerability Information
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Vulnerability Title
Unathenticated connection can hold Bolt channel open
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
长度参数不一致性处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Neo4j Enterprise Edition 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Neo4j Enterprise Edition是美国Neo4j公司的一款企业级图数据库软件。 Neo4j Enterprise Edition 2025.01至2026.07之前版本和5.0至5.26.29之前版本，以及Neo4j Community Edition 2025.01至2026.07之前版本和5.0至5.26.29之前版本存在输入验证错误漏洞，该漏洞源于Bolt modern handshake解码器错误处理过长的能力位掩码，当未经身份验证的客户端发送选定的协议版本及32个连续字节后，解码
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
neo4j Enterprise Edition 2025.01 ~ 2026.07 -
neo4j Community Edition 2025.01 ~ 2026.07 -

II. Public POCs for CVE-2026-14587

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III. Intelligence Information for CVE-2026-14587

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Vendor Pages for CVE-2026-14587 (1)

IV. Related Vulnerabilities

Same product: Enterprise Edition
Same vendor: neo4j
Same weakness: CWE-130

V. Comments for CVE-2026-14587

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