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

Vulnerability from cvelistv5 – Published: 2026-08-05 16:10 – Updated: 2026-08-05 18:41
VLAI
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
References
Impacted products
Vendor Product Version
neo4j Enterprise Edition Affected: 2025.01 , < 2026.07 (date)
Affected: 5.0 , < 5.26.29 (semver)
Create a notification for this product.
neo4j Community Edition Affected: 2025.01 , < 2026.07 (date)
Affected: 5.0 , < 5.26.29 (semver)
Create a notification for this product.
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/
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-14587",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-05T18:15:40.647577Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-05T18:41:20.229Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Enterprise Edition",
          "vendor": "neo4j",
          "versions": [
            {
              "lessThan": "2026.07",
              "status": "affected",
              "version": "2025.01",
              "versionType": "date"
            },
            {
              "lessThan": "5.26.29",
              "status": "affected",
              "version": "5.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://mvnrepository.com/artifact/org.neo4j/",
          "defaultStatus": "unaffected",
          "packageName": "neo4j",
          "product": "Community Edition",
          "repo": "https://github.com/neo4j/neo4j",
          "vendor": "neo4j",
          "versions": [
            {
              "lessThan": "2026.07",
              "status": "affected",
              "version": "2025.01",
              "versionType": "date"
            },
            {
              "lessThan": "5.26.29",
              "status": "affected",
              "version": "5.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "liyi.zhou@sydney.edu.au (Liyi), https://lzhou1110.github.io/"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "ziyue0530@gmail.com (Ziyue), https://zyy0530.github.io/"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "cshe0476@uni.sydney.edu.au (Strick), https://str1ckl4nd.github.io/"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "chng0012@uni.sydney.edu.au (Maurice), http://maurice.busystar.org/"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "cyu210608@gmail.com (Chenchen), https://7thparkk.github.io/"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eNeo4j\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.\u003c/p\u003e\u003cp\u003eBecause 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.\u003c/p\u003e\u003cp\u003eThis can be triggered before authentication by any client that can reach the Bolt connector.\u003c/p\u003e"
            }
          ],
          "value": "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."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-227",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-227 Sustained Client Engagement"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "PROOF_OF_CONCEPT",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "CWE-130 Improper handling of length parameter inconsistency",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T16:10:47.327Z",
        "orgId": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
        "shortName": "Neo4j"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://neo4j.com/security/CVE-2026-14587"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Unathenticated connection can hold Bolt channel open",
      "x_generator": {
        "engine": "Vulnogram 1.0.2"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
    "assignerShortName": "Neo4j",
    "cveId": "CVE-2026-14587",
    "datePublished": "2026-08-05T16:10:47.327Z",
    "dateReserved": "2026-07-03T12:01:33.324Z",
    "dateUpdated": "2026-08-05T18:41:20.229Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-14587\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-05T18:15:40.647577Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-05T18:15:47.026Z\"}}], \"cna\": {\"title\": \"Unathenticated connection can hold Bolt channel open\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"liyi.zhou@sydney.edu.au (Liyi), https://lzhou1110.github.io/\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"ziyue0530@gmail.com (Ziyue), https://zyy0530.github.io/\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"cshe0476@uni.sydney.edu.au (Strick), https://str1ckl4nd.github.io/\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"chng0012@uni.sydney.edu.au (Maurice), http://maurice.busystar.org/\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"cyu210608@gmail.com (Chenchen), https://7thparkk.github.io/\"}], \"impacts\": [{\"capecId\": \"CAPEC-227\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-227 Sustained Client Engagement\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.5, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"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\", \"exploitMaturity\": \"PROOF_OF_CONCEPT\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"neo4j\", \"product\": \"Enterprise Edition\", \"versions\": [{\"status\": \"affected\", \"version\": \"2025.01\", \"lessThan\": \"2026.07\", \"versionType\": \"date\"}, {\"status\": \"affected\", \"version\": \"5.0\", \"lessThan\": \"5.26.29\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://github.com/neo4j/neo4j\", \"vendor\": \"neo4j\", \"product\": \"Community Edition\", \"versions\": [{\"status\": \"affected\", \"version\": \"2025.01\", \"lessThan\": \"2026.07\", \"versionType\": \"date\"}, {\"status\": \"affected\", \"version\": \"5.0\", \"lessThan\": \"5.26.29\", \"versionType\": \"semver\"}], \"packageName\": \"neo4j\", \"collectionURL\": \"https://mvnrepository.com/artifact/org.neo4j/\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://neo4j.com/security/CVE-2026-14587\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.2\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eNeo4j\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.\u003c/p\u003e\u003cp\u003eBecause 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.\u003c/p\u003e\u003cp\u003eThis can be triggered before authentication by any client that can reach the Bolt connector.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-130\", \"description\": \"CWE-130 Improper handling of length parameter inconsistency\"}]}], \"providerMetadata\": {\"orgId\": \"3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6\", \"shortName\": \"Neo4j\", \"dateUpdated\": \"2026-08-05T16:10:47.327Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-14587\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T18:41:20.229Z\", \"dateReserved\": \"2026-07-03T12:01:33.324Z\", \"assignerOrgId\": \"3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6\", \"datePublished\": \"2026-08-05T16:10:47.327Z\", \"assignerShortName\": \"Neo4j\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.