Vulnerability-Lookup

GHSA-CWVV-9488-X4H5

Vulnerability from github – Published: 2026-08-05 18:31 – Updated: 2026-08-05 18:31

Details

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.

Severity

5.5 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-14587"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-130"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-05T17:16:41Z",
    "severity": "MODERATE"
  },
  "details": "Neo4j\u0027s 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.\n\n\n\nBecause 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.\n\n\n\nThis can be triggered before authentication by any client that can reach the Bolt connector.",
  "id": "GHSA-cwvv-9488-x4h5",
  "modified": "2026-08-05T18:31:37Z",
  "published": "2026-08-05T18:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14587"
    },
    {
      "type": "WEB",
      "url": "https://neo4j.com/security/CVE-2026-14587"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-14587 (GCVE-0-2026-14587)

Vulnerability from cvelistv5 – Published: 2026-08-05 16:10 – Updated: 2026-08-05 18:41

Title

Unathenticated connection can hold Bolt channel open

Summary

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.

Severity

5.5 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-130 - Improper handling of length parameter inconsistency

Assigner

Neo4j

References

1 reference

URL	Tags
https://neo4j.com/security/CVE-2026-14587	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
neo4j	Enterprise Edition	Affected: 2025.01 , < 2026.07 (date) Affected: 5.0 , < 5.26.29 (semver)
neo4j	Community Edition	Affected: 2025.01 , < 2026.07 (date) Affected: 5.0 , < 5.26.29 (semver)

Credits

liyi.zhou@sydney.edu.au (Liyi), https://lzhou1110.github.io/ ziyue0530@gmail.com (Ziyue), https://zyy0530.github.io/ cshe0476@uni.sydney.edu.au (Strick), https://str1ckl4nd.github.io/ chng0012@uni.sydney.edu.au (Maurice), http://maurice.busystar.org/ cyu210608@gmail.com (Chenchen), https://7thparkk.github.io/

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-CWVV-9488-X4H5

CVE-2026-14587 (GCVE-0-2026-14587)

Tags

Sightings

Nomenclature