🛡️ CVE-2026-14587 on Ubuntu — bolt

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

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.

Distribution advisory

This page covers CVE-2026-14587 as tracked by Ubuntu, for the package bolt. No fixed version has been recorded for this distribution yet.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

UBUNTU-CVE-2026-14587 is classified as CWE-130: Improper Handling of Length Parameter Inconsistency. The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

Affected software

UBUNTU-CVE-2026-14587 is recorded against 1 package.

bolt

Timeline and source

Published on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
neo4j.com (Report)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector 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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-08-06

Updated 2026-08-11

Modified 2026-08-06

Fix URL N/A

Affected Packages

Software	From version	Fixed in
bolt	—	—

References

REPORT https://ubuntu.com/security/CVE-2026-14587

REPORT https://www.cve.org/CVERecord?id=CVE-2026-14587

REPORT https://neo4j.com/security/CVE-2026-14587

🔗 NVD 🔗 Mitre

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