{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative/",
          "defaultStatus": "unaffected",
          "packageName": "io.netty:netty-tcnative",
          "packageURL": "pkg:maven/io.netty/netty-tcnative",
          "product": "netty-tcnative",
          "repo": "https://github.com/netty/netty-tcnative",
          "vendor": "netty",
          "versions": [
            {
              "lessThan": "2.0.84.Final",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        },
        {
          "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/",
          "defaultStatus": "unaffected",
          "packageName": "io.netty:netty-tcnative-boringssl-static",
          "packageURL": "pkg:maven/io.netty/netty-tcnative-boringssl-static",
          "product": "netty-tcnative-boringssl-static",
          "repo": "https://github.com/netty/netty-tcnative",
          "vendor": "netty",
          "versions": [
            {
              "lessThan": "2.0.84.Final",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Yu Bao, PayPal Cyber Security Team"
        }
      ],
      "datePublic": "2026-08-07T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-26T14:59:39.460Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-gf9q-9mg7-g5qh)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh"
        },
        {
          "name": "Patch Commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199"
        },
        {
          "name": "netty-tcnative netty-tcnative-parent-2.0.84.Final Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/netty/netty-tcnative"
        },
        {
          "name": "VulnCheck Advisory: Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"
        }
      ],
      "title": "Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-116539",
    "datePublished": "2026-10-26T14:59:39.460Z",
    "dateReserved": "2026-10-26T14:30:57.254Z",
    "dateUpdated": "2026-10-26T14:59:39.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}