CVE-2026-6554

{
  "id": "CVE-2026-6554",
  "sourceIdentifier": "[email protected]",
  "published": "2026-09-05T19:16:56.067",
  "lastModified": "2026-10-22T21:17:21.727",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations.  A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "The Tcpdump Group",
          "product": "libpcap",
          "defaultStatus": "unaffected",
          "modules": [
            "BPF interpreter"
          ],
          "programFiles": [
            "bpf_filter.c"
          ],
          "programRoutines": [
            {
              "name": "pcapint_filter_with_aux_data()"
            }
          ],
          "repo": "https://github.com/the-tcpdump-group/libpcap/",
          "versions": [
            {
              "version": "0",
              "lessThan": "1.10.7",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-09-08T15:14:56.820512Z",
          "id": "CVE-2026-6554",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6e14795a8e0ce",
      "source": "[email protected]"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/22/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}