netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount

{
  "id": "6dcba9ae543be73f2903557ce78ae2d9ce2576d5b0553fd97a50111791b4a572",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116541",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount",
    "summary": "Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.",
    "evidence": "cve:CVE-2026-116541",
    "products": [
      {
        "name": {
          "value": "netty-tcnative",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "netty-tcnative-boringssl-static",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116541",
      "aliases": [
        "CVE-2026-116541"
      ],
      "metrics": [
        {
          "format": "CVSS",
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 8.2,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE"
          }
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 5.9,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "HIGH",
            "availabilityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "repo": "https://github.com/netty/netty-tcnative",
          "vendor": "netty",
          "product": "netty-tcnative",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.0.84.Final",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:maven/io.netty/netty-tcnative",
          "packageName": "io.netty:netty-tcnative",
          "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative/",
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://github.com/netty/netty-tcnative",
          "vendor": "netty",
          "product": "netty-tcnative-boringssl-static",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "2.0.84.Final",
              "versionType": "custom"
            }
          ],
          "packageURL": "pkg:maven/io.netty/netty-tcnative-boringssl-static",
          "packageName": "io.netty:netty-tcnative-boringssl-static",
          "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/",
          "defaultStatus": "unaffected"
        }
      ],
      "modified": "2026-10-26T19:48:35.492Z",
      "provider": "cve",
      "references": [
        "https://github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489",
        "https://github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b",
        "https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L240",
        "https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final",
        "https://github.com/netty/netty-tcnative",
        "https://www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-116541",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-26T19:30:21.899747Z"
                  }
                }
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-26T19:48:35.492Z"
            }
          }
        ],
        "cna": {
          "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
          "shortName": "VulnCheck",
          "dateUpdated": "2026-10-26T14:59:40.847Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116541",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 338312,
  "published_at": "2026-10-26T14:59:40.847+00:00"
}