{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.2.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "de65234f67d2608b54d12571edb585ead224363c"
            },
            {
              "fixed": "67b6d03ebaa3341e2eee2aa74502003fd11e31de"
            }
          ],
          "repo": "https://github.com/vbpf/prevail",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-65rv-h458-cq99"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-682"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53671.json"
  },
  "details": "PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the abstract transformer in prevail treats writes through a T_CTX-typed base register as a silent no-op: do_mem_store in src/crab/ebpf_transformer.cpp only models T_STACK stores, and the checker's T_CTX bounds arm never tests AccessType::write. An attacker can craft an eBPF program that overwrites a context field (e.g., ctx-\u003edata), reload that field typed as T_PACKET, and dereference an attacker-controlled address — and prevail will report the program as safe. This issue has been patched in version 0.2.4.",
  "id": "CVE-2026-53671",
  "modified": "2026-09-04T03:30:57.023860521Z",
  "published": "2026-09-02T17:54:30.682Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vbpf/prevail/releases/tag/v0.2.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53671.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vbpf/prevail/security/advisories/GHSA-65rv-h458-cq99"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53671"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vbpf/prevail/commit/de65234f67d2608b54d12571edb585ead224363c"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PREVAIL: Context-write no-op in do_mem_store allows unsafe eBPF programs to pass verification"
}