{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.8.x"
              },
              {
                "last_affected": "1.8.x"
              },
              {
                "introduced": "1.9.x"
              },
              {
                "last_affected": "1.9.x"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "b525001719c0d86e191eabf55ba6fc37410868df"
            },
            {
              "fixed": "b9590d482986d64673712460aae1d48d11fa0473"
            }
          ],
          "repo": "https://github.com/the-tcpdump-group/libpcap",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.8.x",
        "1.9.x"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Tcpdump",
    "cwe_ids": [
      "CWE-126",
      "CWE-1288"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18238.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.10.x"
          },
          {
            "fixed": "1.10.7"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers.  A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.",
  "id": "CVE-2026-18238",
  "modified": "2026-09-07T03:30:37.662238071Z",
  "published": "2026-09-05T18:51:57.956Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/the-tcpdump-group/libpcap/"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18238.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18238"
    },
    {
      "type": "FIX",
      "url": "https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OOBR in rpcap client in libpcap before 1.10.7"
}