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Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure

Type: advisorySources: OSV

The TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned length to `0xFFFFFFFF`, which makes the bounds check that follows vacuous and sends the parser reading past the session packet buffer. The trigger is a four-byte handshake header and requires no cryptographic validity. It is reachable pre-authentication.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-92853
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 10:24 UTC · Revision 1

Source evidence

Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure

core-osv · Original source

Published 20 Oct 2026, 15:10 UTC

The TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned length to `0xFFFFFFFF`, which makes the bounds check that follows vacuous and sends the parser reading past the session packet buffer. The trigger is a four-byte handshake header and requires no cryptographic validity. It is reachable pre-authentication.

osv:CVE-2026-92853
Complete source record
{
  "id": "e1a8a4a02cbb46e93f64bb0e8d41669eda939aac9710fbfb5fadbd2613541b5a",
  "url": "https://osv.dev/vulnerability/CVE-2026-92853",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure",
    "summary": "The TLS 1.3 Certificate-message parser in NetX Secure decrements the message length to skip a context byte without first establishing that the message has a byte to skip. A zero-length Certificate message therefore wraps the unsigned length to `0xFFFFFFFF`, which makes the bounds check that follows vacuous and sends the parser reading past the session packet buffer. The trigger is a four-byte handshake header and requires no cryptographic validity. It is reachable pre-authentication.",
    "evidence": "osv:CVE-2026-92853",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-92853",
      "aliases": [
        "CVE-2026-92853",
        "GHSA-893m-9g4r-4992"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/eclipse-threadx/netxduo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "1a0e9e43a03e37ddecfb6b49e9b078d6e1803d05"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "6.5.1.202602"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.4.1_rel",
            "v6.5.1.202602_rel",
            "v6.5.0.202601_rel",
            "v6.4.5.202504_rel",
            "v6.4.4.202503a",
            "v.6.4.4.202503_rel",
            "v6.4.3_rel",
            "v6.4.2_rel",
            "v6.4.0_rel",
            "v6.3.0_rel",
            "v6.2.1_rel",
            "v6.2.0_rel",
            "v6.1.12_rel",
            "v6.1.11_rel",
            "v6.1.10_rel",
            "v6.1.9_rel",
            "v6.1.8_rel",
            "v6.1.7_rel",
            "v6.1.6_rel",
            "v6.1.5_rel",
            "v6.1.4_rel",
            "v6.1.3_rel",
            "v6.1.2_rel",
            "v6.1_rel",
            "v6.0.2_rel",
            "v6.0.1_rel",
            "v6.0_rel"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92853.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.840704353Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92853.json",
        "https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-893m-9g4r-4992",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92853"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125",
          "CWE-191"
        ],
        "cna_assigner": "eclipse",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92853.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92853",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494482,
  "published_at": "2026-10-20T15:10:08.102+00:00"
}