{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "remote packet capture client"
          ],
          "product": "libpcap",
          "programFiles": [
            "pcap-rpcap.c"
          ],
          "programRoutines": [
            {
              "name": "pcap_read_nocb_remote()"
            }
          ],
          "repo": "https://github.com/the-tcpdump-group/libpcap/",
          "vendor": "The Tcpdump Group",
          "versions": [
            {
              "status": "affected",
              "version": "1.8.x"
            },
            {
              "status": "affected",
              "version": "1.9.x"
            },
            {
              "lessThan": "1.10.7",
              "status": "affected",
              "version": "1.10.x",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "The problem is specific to the remote packet capture code, which is not enabled in the default build configuration."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "A functional exploit exists."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1288",
              "description": "CWE-1288: Improper Validation of Consistency within Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-126",
              "description": "CWE-126 Buffer Over-read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-05T18:51:57.956Z",
        "orgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896",
        "shortName": "Tcpdump"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to libpcap 1.10.7."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "OOBR in rpcap client in libpcap before 1.10.7",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896",
    "assignerShortName": "Tcpdump",
    "cveId": "CVE-2026-18238",
    "datePublished": "2026-09-05T18:51:57.956Z",
    "dateReserved": "2026-07-29T13:32:44.322Z",
    "dateUpdated": "2026-09-05T18:51:57.956Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-18238\",\"sourceIdentifier\":\"security@tcpdump.org\",\"published\":\"2026-09-05T19:16:55.477\",\"lastModified\":\"2026-09-05T19:16:55.477\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"security@tcpdump.org\",\"affectedData\":[{\"vendor\":\"The Tcpdump Group\",\"product\":\"libpcap\",\"defaultStatus\":\"unaffected\",\"modules\":[\"remote packet capture client\"],\"programFiles\":[\"pcap-rpcap.c\"],\"programRoutines\":[{\"name\":\"pcap_read_nocb_remote()\"}],\"repo\":\"https://github.com/the-tcpdump-group/libpcap/\",\"versions\":[{\"version\":\"1.8.x\",\"status\":\"affected\"},{\"version\":\"1.9.x\",\"status\":\"affected\"},{\"version\":\"1.10.x\",\"lessThan\":\"1.10.7\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@tcpdump.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N\",\"baseScore\":5.0,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.1,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"security@tcpdump.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-126\"},{\"lang\":\"en\",\"value\":\"CWE-1288\"}]}],\"references\":[{\"url\":\"https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473\",\"source\":\"security@tcpdump.org\"}]}}"
  }
}